diff --git a/llvm/docs/Phabricator.rst b/llvm/docs/Phabricator.rst
--- a/llvm/docs/Phabricator.rst
+++ b/llvm/docs/Phabricator.rst
@@ -47,6 +47,14 @@
   arc diff HEAD~
 
 
+To create a revision as a working draft, you can add the `--draft` option to
+above the command:
+
+::
+
+  arc diff --draft HEAD~
+
+
 If you later update your commit message, you need to add the `--verbatim`
 option to have `arc` update the description on Phabricator: