difftool: teach difftool to handle directory diffs

diff --git a/Documentation/git-difftool.txt b/Documentation/git-difftool.txt
index fe38f667f9cd232c3c7a8bc7653648995b3ce4aa..aba5e76c52761af456db7f2c00786a9b5a1d97fa 100644 (file)
--- a/Documentation/git-difftool.txt
+++ b/Documentation/git-difftool.txt
@@ -19,6 +19,12 @@ linkgit:git-diff[1].
 
 OPTIONS
 -------
+-d::
+--dir-diff::
+       Copy the modified files to a temporary location and perform
+       a directory diff on them. This mode never prompts before
+       launching the diff tool.
+
 -y::
 --no-prompt::
        Do not prompt before launching a diff tool.