diff --git a/src/main/scala/service/IssuesService.scala b/src/main/scala/service/IssuesService.scala
index 15ef928..aa1ca65 100644
--- a/src/main/scala/service/IssuesService.scala
+++ b/src/main/scala/service/IssuesService.scala
@@ -75,16 +75,16 @@
   import java.net.URLEncoder
   import javax.servlet.http.HttpServletRequest
 
-  case class IssueSearchCondition(labels: Set[String], milestoneId: Option[Int], state: String, sort: Option[String], direction: Option[String]){
+  case class IssueSearchCondition(labels: Set[String], milestoneId: Option[Int], state: String, sort: String, direction: String){
     import IssueSearchCondition._
 
     def toURL(repository: service.RepositoryService.RepositoryInfo)(implicit context: app.Context): String = {
       val params = List(
         if(labels.isEmpty) None else Some("labels=" + urlEncode(labels.mkString(" "))),
         milestoneId.map("milestone=" + _),
-        Some("state=" + urlEncode(state)),
-        sort.map("sort=" + urlEncode(_)),
-        direction.map("direction=" + urlEncode(_))
+        Some("state="     + urlEncode(state)),
+        Some("sort="      + urlEncode(sort)),
+        Some("direction=" + urlEncode(direction))
       )
       "%s/%s/%s/issues?%s".format(context.path, repository.owner, repository.name, params.flatten.mkString("&"))
     }
@@ -94,17 +94,17 @@
 
     private def urlEncode(value: String): String = URLEncoder.encode(value, "UTF-8")
 
-    private def param(request: HttpServletRequest, name: String): Option[String] = {
+    private def param(request: HttpServletRequest, name: String, allow: Seq[String] = Nil): Option[String] = {
       val value = request.getParameter(name)
-      if(value == null || value.isEmpty) None else Some(value)
+      if(value == null || value.isEmpty || (allow.nonEmpty && !allow.contains(value))) None else Some(value)
     }
 
     def apply(request: HttpServletRequest): IssueSearchCondition =
       IssueSearchCondition(
         param(request, "labels").map(_.split(" ").toSet).getOrElse(Set.empty),
         param(request, "milestone").map(_.toInt),
-        param(request, "state").getOrElse("open"),
-        param(request, "sort"),
-        param(request, "direction"))
+        param(request, "state",     Seq("open", "closed")).getOrElse("open"),
+        param(request, "sort",      Seq("created", "comments", "updated")).getOrElse("created"),
+        param(request, "direction", Seq("asc", "desc")).getOrElse("desc"))
   }
 }
diff --git a/src/main/twirl/issues/issues.scala.html b/src/main/twirl/issues/issues.scala.html
index acf648e..6109057 100644
--- a/src/main/twirl/issues/issues.scala.html
+++ b/src/main/twirl/issues/issues.scala.html
@@ -89,16 +89,24 @@
       </div>
       <div class="btn-group">
         <button class="btn dropdown-toggle" data-toggle="dropdown">
-          Sort: <strong>Newest</strong>
+          Sort:
+          <strong>
+            @if(condition.sort == "created"  && condition.direction == "desc"){ Newest }
+            @if(condition.sort == "created"  && condition.direction == "asc" ){ Oldest }
+            @if(condition.sort == "comments" && condition.direction == "desc"){ Most commented }
+            @if(condition.sort == "comments" && condition.direction == "asc" ){ Least commented }
+            @if(condition.sort == "updated"  && condition.direction == "desc"){ Recently updated }
+            @if(condition.sort == "updated"  && condition.direction == "asc" ){ Least recently updated }
+          </strong>
           <span class="caret"></span>
         </button>
         <ul class="dropdown-menu">
-          <li><a href="#">Newest</a></li>
-          <li><a href="#">Oldest</a></li>
-          <li><a href="#">Most commented</a></li>
-          <li><a href="#">Least commented</a></li>
-          <li><a href="#">Recently updated</a></li>
-          <li><a href="#">Least recently updated</a></li>
+          <li><a href="@condition.copy(sort="created",  direction="desc").toURL(repository)">Newest</a></li>
+          <li><a href="@condition.copy(sort="created",  direction="asc" ).toURL(repository)">Oldest</a></li>
+          <li><a href="@condition.copy(sort="comments", direction="desc").toURL(repository)">Most commented</a></li>
+          <li><a href="@condition.copy(sort="comments", direction="asc" ).toURL(repository)">Least commented</a></li>
+          <li><a href="@condition.copy(sort="updated",  direction="desc").toURL(repository)">Recently updated</a></li>
+          <li><a href="@condition.copy(sort="updated",  direction="asc" ).toURL(repository)">Least recently updated</a></li>
         </ul>
       </div>
       <table class="table table-bordered table-hover">