diff --git a/visualization_msgs/msg/Marker.msg b/visualization_msgs/msg/Marker.msg
index b921111f..07de0dc8 100644
--- a/visualization_msgs/msg/Marker.msg
+++ b/visualization_msgs/msg/Marker.msg
@@ -16,7 +16,7 @@ int32 POINTS=8
 int32 TEXT_VIEW_FACING=9
 int32 MESH_RESOURCE=10
 int32 TRIANGLE_LIST=11
-int32 ARROW_STRIP=12
+int32 ARROW_STRIP=12 # Currently unimplemented
 
 int32 ADD=0
 int32 MODIFY=0