diff --git a/doc/readme.md b/doc/readme.md
index c895727..bf69b5c 100644
--- a/doc/readme.md
+++ b/doc/readme.md
@@ -8,3 +8,4 @@
  * [Activity Types](activity.md)
  * [Notification Email](notification.md)
  * [Automatic Schema Updating](auto_update.md)
+ * [Release Operation](release.md)
diff --git a/doc/release.md b/doc/release.md
new file mode 100644
index 0000000..ca5c6c0
--- /dev/null
+++ b/doc/release.md
@@ -0,0 +1,66 @@
+Release Operation
+========
+
+Update version number
+--------
+
+Note to update version number in files below:
+
+### project/build.scala
+
+```scala
+object MyBuild extends Build {
+  val Organization = "gitbucket"
+  val Name = "gitbucket"
+  val Version = "3.2.0" // <---- update here!!
+  val ScalaVersion = "2.11.6"
+  val ScalatraVersion = "2.3.1"
+```
+
+### src/main/scala/gitbucket/core/servlet/AutoUpdate.scala
+
+```scala
+object AutoUpdate {
+
+  /**
+   * The history of versions. A head of this sequence is the current BitBucket version.
+   */
+  val versions = Seq(
+    new Version(3, 2), // <---- add this!!
+    new Version(3, 1),
+    ...
+```
+
+### etc/deploy-assembly.sh
+
+```bash
+#!/bin/sh
+mvn deploy:deploy-file \
+  -DgroupId=gitbucket\
+  -DartifactId=gitbucket-assembly\
+  -Dversion=3.2.0\ # <---- update here!!
+  -Dpackaging=jar\
+  -Dfile=../target/scala-2.11/gitbucket-assembly-x.x.x.jar\ # <---- update here!!
+  -DrepositoryId=sourceforge.jp\
+  -Durl=scp://shell.sourceforge.jp/home/groups/a/am/amateras/htdocs/mvn/
+```
+
+Release
+--------
+
+Note: Release operation requires And and Maven.
+
+### Make release war file
+
+Run ant with `build.xml` in the root directory. The release war file is generated into `target/scala-2.11/gitbucket.war`.
+
+### Deploy assemnbly jar file
+
+For plug-in development, we have to publish the assembly jar file to the public Maven repository.
+
+```
+./sbt.sh assembly
+
+cd etc
+./deploy-assembly.sh
+```
diff --git a/etc/deploy-assemby-jar.sh b/etc/deploy-assemby-jar.sh
index 6bbebb3..62d99b7 100755
--- a/etc/deploy-assemby-jar.sh
+++ b/etc/deploy-assemby-jar.sh
@@ -2,7 +2,7 @@
 mvn deploy:deploy-file \
   -DgroupId=gitbucket\
   -DartifactId=gitbucket-assembly\
-  -Dversion=3.1.1\
+  -Dversion=3.2.0\
   -Dpackaging=jar\
   -Dfile=../target/scala-2.11/gitbucket-assembly-3.2.0.jar\
   -DrepositoryId=sourceforge.jp\