diff --git a/Makefile b/Makefile
index 534fc68..8b11e42 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,11 @@ POVDEP = contexte.inc hexacone.inc hexabenz.inc		\
 		dynamic.inc trident.inc groundbase.inc	\
 		gadgets.inc
 
-CK=180
+#    !   Define a default value for the POV clock
+#    !   You can overide with this command line :
+#        $ make CK=449 essai.png
+
+CK=225
 
 PNG:	essai.png scene.png topview.png passage.png	\
 	orbite.png hexabenz.png escadrille.png		\