diff --git a/ChangeLog b/ChangeLog
index 2f31ac0264..a3dcce8a84 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Apr 22 18:34:31 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* doc/regexp.rdoc (comments): [DOC] terminators cannot appear in
+	  comments.  [ruby-core:74838] [Bug #12256]
+
 Fri Apr 22 18:30:50 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* extension.rdoc, extension.ja.rdoc: [DOC] Fix some errors.
diff --git a/doc/regexp.rdoc b/doc/regexp.rdoc
index 810f15ce1a..8564258115 100644
--- a/doc/regexp.rdoc
+++ b/doc/regexp.rdoc
@@ -568,6 +568,9 @@ Comments can be included in a non-<tt>x</tt> pattern with the
 <tt>(?#</tt><i>comment</i><tt>)</tt> construct, where <i>comment</i> is
 arbitrary text ignored by the regexp engine.
 
+Comments in regexp literals cannot include unescaped terminator
+characters.
+
 == Encoding
 
 Regular expressions are assumed to use the source encoding. This can be
diff --git a/version.h b/version.h
index e9e941843e..8f73dd0d82 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.2.5"
 #define RUBY_RELEASE_DATE "2016-04-22"
-#define RUBY_PATCHLEVEL 311
+#define RUBY_PATCHLEVEL 312
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 4