Documentation/git-merge: document subtree strategy.

There was already some documentation about subtree under
Documentation/howto but it was missing from git-merge manpage.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/merge-strategies.txt b/Documentation/merge-strategies.txt
index 7df0266ba88b13db52a10b2af6dc620b851b9695..1276f858ade29bec40716d19cf56fe6e3882fc25 100644 (file)
--- a/Documentation/merge-strategies.txt
+++ b/Documentation/merge-strategies.txt
@@ -33,3 +33,10 @@ ours::
        merge is always the current branch head.  It is meant to
        be used to supersede old development history of side
        branches.
        merge is always the current branch head.  It is meant to
        be used to supersede old development history of side
        branches.

+
+subtree::
+       This is a modified recursive strategy. When merging trees A and
+       B, if B corresponds to a subtree of A, B is first adjusted to
+       match the tree structure of A, instead of reading the trees at
+       the same level. This adjustment is also done to the common
+       ancestor tree.