From Fedora
--- ipchains-1.3.10/ipchains.8
+++ ipchains-1.3.10/ipchains.8
@@ -70,7 +70,8 @@
 .I DENY 
 and 
 .I REJECT 
-are the same for ICMP packets.)  
+are the same for ICMP packets). [Note: this is incorrect; setting ICMP to
+REJECT will cause ICMP port unreachables to be sent!] 
 .sp 0.5
 .I MASQ
 is only legal for the forward and user defined chains, and can only be