diff --git a/extensions/libip6t_multiport.man b/extensions/libip6t_multiport.man
index cead84e..684f49f 100644
--- a/extensions/libip6t_multiport.man
+++ b/extensions/libip6t_multiport.man
@@ -1,19 +1,20 @@
 This module matches a set of source or destination ports.  Up to 15
-ports can be specified.  It can only be used in conjunction with
+ports can be specified.  A port range (port:port) counts as two
+ports.  It can only be used in conjunction with
 .B "-p tcp"
 or
 .BR "-p udp" .
 .TP
-.BR "--source-ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--source-ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if the source port is one of the given ports.  The flag
 .B --sports
 is a convenient alias for this option.
 .TP
-.BR "--destination-ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--destination-ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if the destination port is one of the given ports.  The flag
 .B --dports
 is a convenient alias for this option.
 .TP
-.BR "--ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if the both the source and destination ports are equal to each
 other and to one of the given ports.
diff --git a/extensions/libipt_multiport.man b/extensions/libipt_multiport.man
index 4c07608..ba760e9 100644
--- a/extensions/libipt_multiport.man
+++ b/extensions/libipt_multiport.man
@@ -1,19 +1,20 @@
 This module matches a set of source or destination ports.  Up to 15
-ports can be specified.  It can only be used in conjunction with
+ports can be specified.  A port range (port:port) counts as two
+ports.  It can only be used in conjunction with
 .B "-p tcp"
 or
 .BR "-p udp" .
 .TP
-.BR "--source-ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--source-ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if the source port is one of the given ports.  The flag
 .B --sports
 is a convenient alias for this option.
 .TP
-.BR "--destination-ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--destination-ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if the destination port is one of the given ports.  The flag
 .B --dports
 is a convenient alias for this option.
 .TP
-.BR "--ports " "\fIport\fP[,\fIport\fP[,\fIport\fP...]]"
+.BR "--ports " "\fI[!] port\fP[,\fIport\fP[,\fIport:port\fP...]]"
 Match if either the source or destination ports are equal to one of
 the given ports.