diff --git a/Shorewall/rules b/Shorewall/rules
index e2d2d4338..8e686d040 100755
--- a/Shorewall/rules
+++ b/Shorewall/rules
@@ -93,6 +93,8 @@
 #			ranges; if the protocol is "icmp", this column is
 #			interpreted as the destination icmp-type(s).
 #
+#			A port range is expressed as <low port>:<high port>.
+#			
 #			This column is ignored if PROTOCOL = all but must be
 #			entered if any of the following ields are supplied.
 #			In that case, it is suggested that this field contain