git grep: Add "-z/--null" option as in GNU's grep.

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index 0e25bb862704eee4a22fe5349c04823d14ea9cba..eb05b0f49b0c513581150415d1a4e679d7bfbea6 100644 (file)
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -75,8 +75,10 @@ OPTIONS
        read the message from the standard input.
 
 --author=<author>::
-       Override the author name used in the commit.  Use
-       `A U Thor <author@example.com>` format.
+       Override the author name used in the commit.  You can use the
+       standard `A U Thor <author@example.com>` format.  Otherwise,
+       an existing commit that matches the given string and its author
+       name is used.
 
 -m <msg>::
 --message=<msg>::