--- a/git.rst	Mon Jun 26 11:29:46 2017 +0300
+++ b/git.rst	Mon Jun 26 18:32:03 2017 +0300
@@ -121,7 +121,7 @@
 
   $ $EDITOR Makefile
   $ git add Makefile
-  $ git diff
+  $ git diff --cached
   $ git commit -m "..."
 
 Commit all changed and previously manages files::