diff --git a/ChangeLog b/ChangeLog
index 3dc56f74d7..72546e9e97 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 16 18:42:58 2015  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* tool/redmine-backporter.rb: support adding related revisions
+	  to issues.
+
 Fri Jan 16 17:20:33 2015  Koichi Sasada  <ko1@atdot.net>
 
 	vm.c, vm_core.h: constify VM_CF_LEP, VM_CF_PREV_EP, VM_CF_BLOCK_PTR
diff --git a/tool/redmine-backporter.rb b/tool/redmine-backporter.rb
index b3e8ea53c9..918584a904 100755
--- a/tool/redmine-backporter.rb
+++ b/tool/redmine-backporter.rb
@@ -298,7 +298,18 @@ eom
     end
     more(sio)
 
+  when /\Arel +(\d+)\z/
+    # this feature requires custom redmine which allows add_related_issue API
+    rev = $1.to_i
+    uri = URI("#{REDMINE_BASE}/projects/ruby-trunk/repository/revisions/#{rev}/issues.json")
+    Net::HTTP.start(uri.host, uri.port, http_options) do |http|
+      res = http.post(uri.path, "issue_id=#@issue",
+                     'X-Redmine-API-Key' => REDMINE_API_KEY)
+      puts res.body
+    end
+
   when 's'
+    # this feature implies backport command which wraps tool/merger.rb
     unless @issue
       puts "ticket not selected"
       next