diff --git a/data/game.cfg b/data/game.cfg
index 0601207a479..c9f108a90a6 100644
--- a/data/game.cfg
+++ b/data/game.cfg
@@ -90,6 +90,7 @@
     partmoved_ball_image="misc/ball-partmoved.png"
     enemy_ball_image="misc/ball-enemy.png"
     ally_ball_image="misc/ball-ally.png"
+    # use preferably the same time duration for each frame 
     flag_image="flags/flag-1.png:150,flags/flag-2.png:150,flags/flag-3.png:150,flags/flag-4.png:150"
     flag_rgb=green