diff --git a/ChangeLog b/ChangeLog
index e34a6b9..10ddcf0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+Changes Prior to this release
+    -   allow --write-behind to be set for --grow.
+
 Changes Prior to 2.6.2 release
     -   --fail detached and --remove faulty can be used to fail and
 	remove devices that are no longer physically present.
diff --git a/mdadm.c b/mdadm.c
index e96ce68..45ffaee 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -844,6 +844,7 @@ int main(int argc, char *argv[])
 			bitmap_chunk = bitmap_chunk ? bitmap_chunk * 1024 : 512;
 			continue;
 
+		case O(GROW, WriteBehind):
 		case O(BUILD, WriteBehind):
 		case O(CREATE, WriteBehind): /* write-behind mode */
 			write_behind = DEFAULT_MAX_WRITE_BEHIND;