howto/using-merge-subtree: mention --allow-unrelated-histories
Without passing --allow-unrelated-histories the command sequence
fails as intended since commit e379fdf34fee ("merge: refuse to create
too cool a merge by default"). To setup a subtree merging unrelated
histories is normal, so add the option to the howto document.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/howto/using-merge-subtree.txt b/Documentation/howto/using-merge-subtree.txt
index 1ae8d12..a499a94 100644
--- a/Documentation/howto/using-merge-subtree.txt
+++ b/Documentation/howto/using-merge-subtree.txt
@@ -33,7 +33,7 @@
----------------
$ git remote add -f Bproject /path/to/B <1>
-$ git merge -s ours --no-commit Bproject/master <2>
+$ git merge -s ours --no-commit --allow-unrelated-histories Bproject/master <2>
$ git read-tree --prefix=dir-B/ -u Bproject/master <3>
$ git commit -m "Merge B project as our subdirectory" <4>
