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diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index fccb82deb4..b753c9d76f 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -122,6 +122,14 @@ OPTIONS
-<num>::
A shortcut for specifying -C<num>.
+-p::
+--show-function::
+ Show the preceding line that contains the function name of
+ the match, unless the matching line is a function name itself.
+ The name is determined in the same way as 'git diff' works out
+ patch hunk headers (see 'Defining a custom hunk-header' in
+ linkgit:gitattributes[5]).
+
-f <file>::
Read patterns from <file>, one per line.