docs: fix description of the `--merge-base` option

Signed-off-by: Kyle Zhao <kylezhao@tencent.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-merge-tree.txt b/Documentation/git-merge-tree.txt
index 298c133fdb6965774a9021fe4d3137ac07ef3464..88ee942101a7748ac2a7b5030b364ed7e27d5fdb 100644 (file)
--- a/Documentation/git-merge-tree.txt
+++ b/Documentation/git-merge-tree.txt
@@ -66,8 +66,8 @@ OPTIONS
 
 --merge-base=<commit>::
        Instead of finding the merge-bases for <branch1> and <branch2>,
-       specify a merge-base for the merge. This option is incompatible
-       with `--stdin`.
+       specify a merge-base for the merge, and specifying multiple bases is
+       currently not supported. This option is incompatible with `--stdin`.
 
 [[OUTPUT]]
 OUTPUT