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diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index 91fb1304971e7872e50114d0363b677611b0f372..9153e4cf2a1020dc9a3b5792ff3f64f7efd9f42c 100644 (file)
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -9,8 +9,9 @@ git-diff-tree - Compares the content and mode of blobs found via two tree object
 SYNOPSIS
 --------
 [verse]
-'git-diff-tree' [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty] [-t] [-r]
-             [--root] [<common diff options>] <tree-ish> [<tree-ish>] [<path>...]
+'git-diff-tree' [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]
+             [-t] [-r] [-c | --cc] [--root] [<common diff options>]
+             <tree-ish> [<tree-ish>] [<path>...]
 
 DESCRIPTION
 -----------
@@ -80,6 +81,24 @@ separated with a single space are given.
        git-diff-tree outputs a line with the commit ID when
        applicable.  This flag suppressed the commit ID output.
 
+-c,--cc::
+       These flags change the way a merge commit is displayed
+       (which means it is useful only when the command is given
+       one <tree-ish>, or '--stdin').  It shows the differences
+       from each of the parents to the merge result
+       simultaneously, instead of showing pairwise diff between
+       a parent and the result one at a time, which '-m' option
+       output does.  '--cc' further compresses the output by
+       omiting hunks that show differences from only one
+       parent, or show the same change from all but one parent
+       for an Octopus merge.  When this optimization makes all
+       hunks disappear, the commit itself and the commit log
+       message is not shown, just like any other "empty diff" cases.
+
+--always::
+       Show the commit itself and the commit log message even
+       if the diff itself is empty.
+
 
 Limiting Output
 ---------------