diff --git a/llvm/docs/Phabricator.rst b/llvm/docs/Phabricator.rst
--- a/llvm/docs/Phabricator.rst
+++ b/llvm/docs/Phabricator.rst
@@ -47,8 +47,12 @@
   arc diff HEAD~
 
 
-To create a revision as a working draft, you can add the `--draft` option to
-above the command:
+Sometime you may want to create a draft revision to show the proof of concept 
+or for experiemntal purpose, In that case you can use the `--draft` option. It 
+will either create a new draft revisoin or convert the original revision to 
+draft revision depending on your local branch status. Good part is: it will not 
+send mail to llvm-commit mailing list, patch reviewers and all other subscribers, 
+buildbot will also run on every patch update:
 
 ::