diff --git a/contrib/subtree/git-subtree.txt b/contrib/subtree/git-subtree.txt
index 352deda69d..9ccd431c7f 100644
--- a/contrib/subtree/git-subtree.txt
+++ b/contrib/subtree/git-subtree.txt
@@ -139,7 +139,7 @@ OPTIONS
 
 -m <message>::
 --message=<message>::
-	This option is only valid for add, merge and pull (unsure).
+	This option is only valid for add, merge, pull, and split --rejoin.
 	Specify <message> as the commit message for the merge commit.