diff --git a/src/main/resources/update/gitbucket-core_4.2.xml b/src/main/resources/update/gitbucket-core_4.2.xml
index b4ad19c..78aa748 100644
--- a/src/main/resources/update/gitbucket-core_4.2.xml
+++ b/src/main/resources/update/gitbucket-core_4.2.xml
@@ -2,8 +2,9 @@
 <changeSet>
     <addColumn tableName="REPOSITORY">
         <column name="ENABLE_ISSUES" type="boolean" nullable="false" defaultValueBoolean="true"/>
-        <column name="ENABLE_WIKI" type="boolean" nullable="false" defaultValueBoolean="true"/>
         <column name="EXTERNAL_ISSUES_URL" type="varchar(200)" nullable="true"/>
+        <column name="ENABLE_WIKI" type="boolean" nullable="false" defaultValueBoolean="true"/>
+        <column name="ALLOW_WIKI_EDITING" type="boolean" nullable="false" defaultValueBoolean="false"/>
         <column name="EXTERNAL_WIKI_URL" type="varchar(200)" nullable="true"/>
     </addColumn>
 </changeSet>
diff --git a/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala b/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
index fd32311..b60ae5d 100644
--- a/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
@@ -32,8 +32,9 @@
     description: Option[String],
     isPrivate: Boolean,
     enableIssues: Boolean,
-    enableWiki: Boolean,
     externalIssuesUrl: Option[String],
+    enableWiki: Boolean,
+    allowWikiEditing: Boolean,
     externalWikiUrl: Option[String]
   )
   
@@ -42,8 +43,9 @@
     "description"       -> trim(label("Description"        , optional(text()))),
     "isPrivate"         -> trim(label("Repository Type"    , boolean())),
     "enableIssues"      -> trim(label("Enable Issues"      , boolean())),
-    "enableWiki"        -> trim(label("Enable Wiki"        , boolean())),
     "externalIssuesUrl" -> trim(label("External Issues URL", optional(text(maxlength(200))))),
+    "enableWiki"        -> trim(label("Enable Wiki"        , boolean())),
+    "allowWikiEditing"  -> trim(label("Allow Wiki Editing" , boolean())),
     "externalWikiUrl"   -> trim(label("External Wiki URL"  , optional(text(maxlength(200)))))
   )(OptionsForm.apply)
 
@@ -106,8 +108,9 @@
         repository.repository.isPrivate
       } getOrElse form.isPrivate,
       form.enableIssues,
-      form.enableWiki,
       form.externalIssuesUrl,
+      form.enableWiki,
+      form.allowWikiEditing,
       form.externalWikiUrl
     )
     // Change repository name
diff --git a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
index b1fa0f9..12ee473 100644
--- a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
@@ -691,8 +691,6 @@
   private def isEditable(owner: String, repository: String, author: String)(implicit context: Context): Boolean =
     hasWritePermission(owner, repository, context.loginAccount) || author == context.loginAccount.get.userName
 
-
-
   override protected def renderUncaughtException(e: Throwable)(implicit request: HttpServletRequest, response: HttpServletResponse): Unit = {
     e.printStackTrace()
   }
diff --git a/src/main/scala/gitbucket/core/controller/WikiController.scala b/src/main/scala/gitbucket/core/controller/WikiController.scala
index 49fb2e2..ad98cee 100644
--- a/src/main/scala/gitbucket/core/controller/WikiController.scala
+++ b/src/main/scala/gitbucket/core/controller/WikiController.scala
@@ -1,7 +1,8 @@
 package gitbucket.core.controller
 
+import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.wiki.html
-import gitbucket.core.service.{RepositoryService, WikiService, ActivityService, AccountService}
+import gitbucket.core.service.{AccountService, ActivityService, RepositoryService, WikiService}
 import gitbucket.core.util._
 import gitbucket.core.util.StringUtil._
 import gitbucket.core.util.ControlUtil._
@@ -39,7 +40,7 @@
   get("/:owner/:repository/wiki")(referrersOnly { repository =>
     getWikiPage(repository.owner, repository.name, "Home").map { page =>
       html.page("Home", page, getWikiPageList(repository.owner, repository.name),
-        repository, hasWritePermission(repository.owner, repository.name, context.loginAccount),
+        repository, isEditable(repository),
         getWikiPage(repository.owner, repository.name, "_Sidebar"),
         getWikiPage(repository.owner, repository.name, "_Footer"))
     } getOrElse redirect(s"/${repository.owner}/${repository.name}/wiki/Home/_edit")
@@ -50,7 +51,7 @@
 
     getWikiPage(repository.owner, repository.name, pageName).map { page =>
       html.page(pageName, page, getWikiPageList(repository.owner, repository.name),
-        repository, hasWritePermission(repository.owner, repository.name, context.loginAccount),
+        repository, isEditable(repository),
         getWikiPage(repository.owner, repository.name, "_Sidebar"),
         getWikiPage(repository.owner, repository.name, "_Footer"))
     } getOrElse redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}/_edit")
@@ -62,7 +63,7 @@
     using(Git.open(getWikiRepositoryDir(repository.owner, repository.name))){ git =>
       JGitUtil.getCommitLog(git, "master", path = pageName + ".md") match {
         case Right((logs, hasNext)) => html.history(Some(pageName), logs, repository)
-        case Left(_) => NotFound
+        case Left(_) => NotFound()
       }
     }
   })
@@ -73,7 +74,7 @@
 
     using(Git.open(getWikiRepositoryDir(repository.owner, repository.name))){ git =>
       html.compare(Some(pageName), from, to, JGitUtil.getDiffs(git, from, to, true).filter(_.newPath == pageName + ".md"), repository,
-        hasWritePermission(repository.owner, repository.name, context.loginAccount), flash.get("info"))
+        isEditable(repository), flash.get("info"))
     }
   })
   
@@ -82,102 +83,115 @@
 
     using(Git.open(getWikiRepositoryDir(repository.owner, repository.name))){ git =>
       html.compare(None, from, to, JGitUtil.getDiffs(git, from, to, true), repository,
-        hasWritePermission(repository.owner, repository.name, context.loginAccount), flash.get("info"))
+        isEditable(repository), flash.get("info"))
     }
   })
 
-  get("/:owner/:repository/wiki/:page/_revert/:commitId")(collaboratorsOnly { repository =>
-    val pageName = StringUtil.urlDecode(params("page"))
-    val Array(from, to) = params("commitId").split("\\.\\.\\.")
+  get("/:owner/:repository/wiki/:page/_revert/:commitId")(referrersOnly { repository =>
+    if(isEditable(repository)){
+      val pageName = StringUtil.urlDecode(params("page"))
+      val Array(from, to) = params("commitId").split("\\.\\.\\.")
 
-    if(revertWikiPage(repository.owner, repository.name, from, to, context.loginAccount.get, Some(pageName))){
-      redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}")
-    } else {
-      flash += "info" -> "This patch was not able to be reversed."
-      redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}/_compare/${from}...${to}")
-    }
-  })
-
-  get("/:owner/:repository/wiki/_revert/:commitId")(collaboratorsOnly { repository =>
-    val Array(from, to) = params("commitId").split("\\.\\.\\.")
-
-    if(revertWikiPage(repository.owner, repository.name, from, to, context.loginAccount.get, None)){
-      redirect(s"/${repository.owner}/${repository.name}/wiki/")
-    } else {
-      flash += "info" -> "This patch was not able to be reversed."
-      redirect(s"/${repository.owner}/${repository.name}/wiki/_compare/${from}...${to}")
-    }
-  })
-
-  get("/:owner/:repository/wiki/:page/_edit")(collaboratorsOnly { repository =>
-    val pageName = StringUtil.urlDecode(params("page"))
-    html.edit(pageName, getWikiPage(repository.owner, repository.name, pageName), repository)
-  })
-  
-  post("/:owner/:repository/wiki/_edit", editForm)(collaboratorsOnly { (form, repository) =>
-    defining(context.loginAccount.get){ loginAccount =>
-      saveWikiPage(
-        repository.owner,
-        repository.name,
-        form.currentPageName,
-        form.pageName,
-        appendNewLine(convertLineSeparator(form.content, "LF"), "LF"),
-        loginAccount,
-        form.message.getOrElse(""),
-        Some(form.id)
-      ).map { commitId =>
-        updateLastActivityDate(repository.owner, repository.name)
-        recordEditWikiPageActivity(repository.owner, repository.name, loginAccount.userName, form.pageName, commitId)
-      }
-      if(notReservedPageName(form.pageName)) {
-        redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(form.pageName)}")
+      if(revertWikiPage(repository.owner, repository.name, from, to, context.loginAccount.get, Some(pageName))){
+        redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}")
       } else {
-        redirect(s"/${repository.owner}/${repository.name}/wiki")
+        flash += "info" -> "This patch was not able to be reversed."
+        redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}/_compare/${from}...${to}")
       }
-    }
+    } else Unauthorized()
+  })
+
+  get("/:owner/:repository/wiki/_revert/:commitId")(referrersOnly { repository =>
+    if(isEditable(repository)){
+      val Array(from, to) = params("commitId").split("\\.\\.\\.")
+
+      if(revertWikiPage(repository.owner, repository.name, from, to, context.loginAccount.get, None)){
+        redirect(s"/${repository.owner}/${repository.name}/wiki/")
+      } else {
+        flash += "info" -> "This patch was not able to be reversed."
+        redirect(s"/${repository.owner}/${repository.name}/wiki/_compare/${from}...${to}")
+      }
+    } else Unauthorized()
+  })
+
+  get("/:owner/:repository/wiki/:page/_edit")(referrersOnly { repository =>
+    if(isEditable(repository)){
+      val pageName = StringUtil.urlDecode(params("page"))
+      html.edit(pageName, getWikiPage(repository.owner, repository.name, pageName), repository)
+    } else Unauthorized()
   })
   
-  get("/:owner/:repository/wiki/_new")(collaboratorsOnly {
-    html.edit("", None, _)
+  post("/:owner/:repository/wiki/_edit", editForm)(referrersOnly { (form, repository) =>
+    if(isEditable(repository)){
+      defining(context.loginAccount.get){ loginAccount =>
+        saveWikiPage(
+          repository.owner,
+          repository.name,
+          form.currentPageName,
+          form.pageName,
+          appendNewLine(convertLineSeparator(form.content, "LF"), "LF"),
+          loginAccount,
+          form.message.getOrElse(""),
+          Some(form.id)
+        ).map { commitId =>
+          updateLastActivityDate(repository.owner, repository.name)
+          recordEditWikiPageActivity(repository.owner, repository.name, loginAccount.userName, form.pageName, commitId)
+        }
+        if(notReservedPageName(form.pageName)) {
+          redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(form.pageName)}")
+        } else {
+          redirect(s"/${repository.owner}/${repository.name}/wiki")
+        }
+      }
+    } else Unauthorized()
   })
   
-  post("/:owner/:repository/wiki/_new", newForm)(collaboratorsOnly { (form, repository) =>
-    defining(context.loginAccount.get){ loginAccount =>
-      saveWikiPage(repository.owner, repository.name, form.currentPageName, form.pageName,
+  get("/:owner/:repository/wiki/_new")(referrersOnly { repository =>
+    if(isEditable(repository)){
+      html.edit("", None, repository)
+    } else Unauthorized()
+  })
+  
+  post("/:owner/:repository/wiki/_new", newForm)(referrersOnly { (form, repository) =>
+    if(isEditable(repository)){
+      defining(context.loginAccount.get){ loginAccount =>
+        saveWikiPage(repository.owner, repository.name, form.currentPageName, form.pageName,
           form.content, loginAccount, form.message.getOrElse(""), None)
 
-      updateLastActivityDate(repository.owner, repository.name)
-      recordCreateWikiPageActivity(repository.owner, repository.name, loginAccount.userName, form.pageName)
+        updateLastActivityDate(repository.owner, repository.name)
+        recordCreateWikiPageActivity(repository.owner, repository.name, loginAccount.userName, form.pageName)
 
-      if(notReservedPageName(form.pageName)) {
-        redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(form.pageName)}")
-      } else {
-        redirect(s"/${repository.owner}/${repository.name}/wiki")
+        if(notReservedPageName(form.pageName)) {
+          redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(form.pageName)}")
+        } else {
+          redirect(s"/${repository.owner}/${repository.name}/wiki")
+        }
       }
-    }
+    } else Unauthorized()
   })
   
-  get("/:owner/:repository/wiki/:page/_delete")(collaboratorsOnly { repository =>
-    val pageName = StringUtil.urlDecode(params("page"))
+  get("/:owner/:repository/wiki/:page/_delete")(referrersOnly { repository =>
+    if(isEditable(repository)){
+      val pageName = StringUtil.urlDecode(params("page"))
 
-    defining(context.loginAccount.get){ loginAccount =>
-      deleteWikiPage(repository.owner, repository.name, pageName, loginAccount.fullName, loginAccount.mailAddress, s"Destroyed ${pageName}")
-      updateLastActivityDate(repository.owner, repository.name)
+      defining(context.loginAccount.get){ loginAccount =>
+        deleteWikiPage(repository.owner, repository.name, pageName, loginAccount.fullName, loginAccount.mailAddress, s"Destroyed ${pageName}")
+        updateLastActivityDate(repository.owner, repository.name)
 
-      redirect(s"/${repository.owner}/${repository.name}/wiki")
-    }
+        redirect(s"/${repository.owner}/${repository.name}/wiki")
+      }
+    } else Unauthorized()
   })
   
   get("/:owner/:repository/wiki/_pages")(referrersOnly { repository =>
-    html.pages(getWikiPageList(repository.owner, repository.name), repository,
-      hasWritePermission(repository.owner, repository.name, context.loginAccount))
+    html.pages(getWikiPageList(repository.owner, repository.name), repository, isEditable(repository))
   })
   
   get("/:owner/:repository/wiki/_history")(referrersOnly { repository =>
     using(Git.open(getWikiRepositoryDir(repository.owner, repository.name))){ git =>
       JGitUtil.getCommitLog(git, "master") match {
         case Right((logs, hasNext)) => html.history(None, logs, repository)
-        case Left(_) => NotFound
+        case Left(_) => NotFound()
       }
     }
   })
@@ -226,4 +240,9 @@
 
   private def targetWikiPage = getWikiPage(params("owner"), params("repository"), params("pageName"))
 
+  private def isEditable(repository: RepositoryInfo)(implicit context: Context): Boolean =
+    repository.repository.allowWikiEditing || (
+      hasWritePermission(repository.owner, repository.name, context.loginAccount)
+    )
+
 }
diff --git a/src/main/scala/gitbucket/core/model/Repository.scala b/src/main/scala/gitbucket/core/model/Repository.scala
index f4e8138..ebdfb3a 100644
--- a/src/main/scala/gitbucket/core/model/Repository.scala
+++ b/src/main/scala/gitbucket/core/model/Repository.scala
@@ -18,10 +18,13 @@
     val parentUserName = column[String]("PARENT_USER_NAME")
     val parentRepositoryName = column[String]("PARENT_REPOSITORY_NAME")
     val enableIssues = column[Boolean]("ENABLE_ISSUES")
-    val enableWiki = column[Boolean]("ENABLE_WIKI")
     val externalIssuesUrl = column[String]("EXTERNAL_ISSUES_URL")
+    val enableWiki = column[Boolean]("ENABLE_WIKI")
+    val allowWikiEditing = column[Boolean]("ALLOW_WIKI_EDITING")
     val externalWikiUrl = column[String]("EXTERNAL_WIKI_URL")
-    def * = (userName, repositoryName, isPrivate, description.?, defaultBranch, registeredDate, updatedDate, lastActivityDate, originUserName.?, originRepositoryName.?, parentUserName.?, parentRepositoryName.?, enableIssues, enableWiki, externalIssuesUrl.?, externalWikiUrl.?) <> (Repository.tupled, Repository.unapply)
+    def * = (userName, repositoryName, isPrivate, description.?, defaultBranch,
+      registeredDate, updatedDate, lastActivityDate, originUserName.?, originRepositoryName.?, parentUserName.?, parentRepositoryName.?,
+      enableIssues, externalIssuesUrl.?, enableWiki, allowWikiEditing, externalWikiUrl.?) <> (Repository.tupled, Repository.unapply)
 
     def byPrimaryKey(owner: String, repository: String) = byRepository(owner, repository)
   }
@@ -41,7 +44,8 @@
   parentUserName: Option[String],
   parentRepositoryName: Option[String],
   enableIssues: Boolean,
-  enableWiki: Boolean,
   externalIssuesUrl: Option[String],
+  enableWiki: Boolean,
+  allowWikiEditing: Boolean,
   externalWikiUrl: Option[String]
 )
diff --git a/src/main/scala/gitbucket/core/service/RepositoryService.scala b/src/main/scala/gitbucket/core/service/RepositoryService.scala
index 15dce71..7167b37 100644
--- a/src/main/scala/gitbucket/core/service/RepositoryService.scala
+++ b/src/main/scala/gitbucket/core/service/RepositoryService.scala
@@ -38,8 +38,9 @@
         parentUserName       = parentUserName,
         parentRepositoryName = parentRepositoryName,
         enableIssues         = true,
-        enableWiki           = true,
         externalIssuesUrl    = None,
+        enableWiki           = true,
+        allowWikiEditing     = true,
         externalWikiUrl      = None
       )
 
@@ -319,10 +320,11 @@
    */
   def saveRepositoryOptions(userName: String, repositoryName: String,
       description: Option[String], isPrivate: Boolean,
-      enableIssues: Boolean, enableWiki: Boolean, externalIssuesUrl: Option[String], externalWikiUrl: Option[String])(implicit s: Session): Unit =
+      enableIssues: Boolean, externalIssuesUrl: Option[String],
+      enableWiki: Boolean, allowWikiEditing: Boolean, externalWikiUrl: Option[String])(implicit s: Session): Unit =
     Repositories.filter(_.byRepository(userName, repositoryName))
-      .map { r => (r.description.?, r.isPrivate, r.enableIssues, r.enableWiki, r.externalIssuesUrl.?, r.externalWikiUrl.?, r.updatedDate) }
-      .update (description, isPrivate, enableIssues, enableWiki, externalIssuesUrl, externalWikiUrl, currentDate)
+      .map { r => (r.description.?, r.isPrivate, r.enableIssues, r.externalIssuesUrl.?, r.enableWiki, r.allowWikiEditing, r.externalWikiUrl.?, r.updatedDate) }
+      .update (description, isPrivate, enableIssues, externalIssuesUrl, enableWiki, allowWikiEditing, externalWikiUrl, currentDate)
 
   def saveRepositoryDefaultBranch(userName: String, repositoryName: String,
       defaultBranch: String)(implicit s: Session): Unit =
diff --git a/src/main/twirl/gitbucket/core/settings/options.scala.html b/src/main/twirl/gitbucket/core/settings/options.scala.html
index cdce8ce..2d5856e 100644
--- a/src/main/twirl/gitbucket/core/settings/options.scala.html
+++ b/src/main/twirl/gitbucket/core/settings/options.scala.html
@@ -51,10 +51,11 @@
                 Issues<br>
                 <div class="normal muted">
                   Provides Lightweight issue tracking integrated with this repository. Add issues to milestones, label issues, and close & reference issues from commit messages.
-                  If you use external issue tracking system, turn off the checkbox above and put that URL into the following box:
                 </div>
               </label>
-              <label for="externalIssuesUrl" class="strong">External URL:</label>
+              <label for="externalIssuesUrl" class="strong">External URL:
+                <span class="normal muted">(Put if you have the external issue tracking system for this project)</span>
+              </label>
               <input type="text" class="form-control" id="externalIssuesUrl" name="externalIssuesUrl" value="@repository.repository.externalIssuesUrl"/>
             </fieldset>
             <fieldset class="form-group margin">
@@ -63,10 +64,15 @@
                 Wiki<br>
                 <div class="normal muted">
                   Provides a simple solution to manage documents. All users who can look this repository can read and collaborators can edit pages.
-                  If you have documents at the outside of GitBucket, turn off the checkbox above and put that URL into the following box:
                 </div>
               </label>
-              <label for="externalWikiUrl" class="strong">External URL:</label>
+              <label class="checkbox" for="allowWikiEditing">
+                <input type="checkbox" id="allowWikiEditing" name="allowWikiEditing"@if(repository.repository.allowWikiEditing){ checked}/>
+                Allow read-only users to edit Wiki pages<br>
+              </label>
+              <label for="externalWikiUrl" class="strong">External URL:
+                <span class="normal muted">(Put if you have the external Wiki for this project)</span>
+              </label>
               <input type="text" class="form-control" id="externalWikiUrl" name="externalWikiUrl" value="@repository.repository.externalWikiUrl"/>
             </fieldset>
           </div>
@@ -89,6 +95,7 @@
 
 function updateFeatures() {
   $('#externalIssuesUrl').prop('disabled', $('#enableIssues').prop('checked'));
+  $('#allowWikiEditing').prop('disabled', !$('#enableWiki').prop('checked'));
   $('#externalWikiUrl').prop('disabled', $('#enableWiki').prop('checked'));
 }
 </script>