diff --git a/README b/README
index 8b906e9..0255f22 100644
--- a/README
+++ b/README
@@ -116,3 +116,10 @@ branch on target.
 
   git rebase merge-and-push
 
+clean
+-----
+
+Remove local and remote branch for issues closed more than 21 days ago. Use
+--no-local to only clean local branches.
+
+  git redmine clean [--local/--no-local]