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-rw-r--r--Documentation/git-diff-tree.txt7
-rw-r--r--Documentation/git-diff.txt8
2 files changed, 12 insertions, 3 deletions
diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index 5c8a2a5e97..2fc24c542f 100644
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -10,7 +10,7 @@ SYNOPSIS
--------
[verse]
'git diff-tree' [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]
- [-t] [-r] [-c | --cc] [--combined-all-paths] [--root]
+ [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base]
[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]
DESCRIPTION
@@ -43,6 +43,11 @@ include::diff-options.txt[]
When `--root` is specified the initial commit will be shown as a big
creation event. This is equivalent to a diff against the NULL tree.
+--merge-base::
+ Instead of comparing the <tree-ish>s directly, use the merge
+ base between the two <tree-ish>s as the "before" side. There
+ must be two <tree-ish>s given and they must both be commits.
+
--stdin::
When `--stdin` is specified, the command does not take
<tree-ish> arguments from the command line. Instead, it
diff --git a/Documentation/git-diff.txt b/Documentation/git-diff.txt
index 762ee6d074..7f4c8a8ce7 100644
--- a/Documentation/git-diff.txt
+++ b/Documentation/git-diff.txt
@@ -11,7 +11,7 @@ SYNOPSIS
[verse]
'git diff' [<options>] [<commit>] [--] [<path>...]
'git diff' [<options>] --cached [--merge-base] [<commit>] [--] [<path>...]
-'git diff' [<options>] <commit> [<commit>...] <commit> [--] [<path>...]
+'git diff' [<options>] [--merge-base] <commit> [<commit>...] <commit> [--] [<path>...]
'git diff' [<options>] <commit>...<commit> [--] [<path>...]
'git diff' [<options>] <blob> <blob>
'git diff' [<options>] --no-index [--] <path> <path>
@@ -62,10 +62,14 @@ of <commit> and HEAD. `git diff --merge-base A` is equivalent to
branch name to compare with the tip of a different
branch.
-'git diff' [<options>] <commit> <commit> [--] [<path>...]::
+'git diff' [<options>] [--merge-base] <commit> <commit> [--] [<path>...]::
This is to view the changes between two arbitrary
<commit>.
++
+If --merge-base is given, use the merge base of the two commits for the
+"before" side. `git diff --merge-base A B` is equivalent to
+`git diff $(git merge-base A B) B`.
'git diff' [<options>] <commit> <commit>... <commit> [--] [<path>...]::