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-rw-r--r--Documentation/git-merge-base.txt9
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/git-merge-base.txt b/Documentation/git-merge-base.txt
index 767486c770..ce5b369985 100644
--- a/Documentation/git-merge-base.txt
+++ b/Documentation/git-merge-base.txt
@@ -8,12 +8,12 @@ git-merge-base - Find as good common ancestors as possible for a merge
SYNOPSIS
--------
-'git merge-base' [--all] <commit> <commit>...
+'git merge-base' [-a|--all] <commit> <commit>...
DESCRIPTION
-----------
-'git-merge-base' finds best common ancestor(s) between two commits to use
+'git merge-base' finds best common ancestor(s) between two commits to use
in a three-way merge. One common ancestor is 'better' than another common
ancestor if the latter is an ancestor of the former. A common ancestor
that does not have any better common ancestor is a 'best common
@@ -27,8 +27,13 @@ commits on the command line. As the most common special case, specifying only
two commits on the command line means computing the merge base between
the given two commits.
+As a consequence, the 'merge base' is not necessarily contained in each of the
+commit arguments if more than two commits are specified. This is different
+from linkgit:git-show-branch[1] when used with the `--merge-base` option.
+
OPTIONS
-------
+-a::
--all::
Output all merge bases for the commits, instead of just one.