diff --git a/doc/userguide/rules/header-keywords.rst b/doc/userguide/rules/header-keywords.rst
index f407af7f05..5e4e3f994a 100644
--- a/doc/userguide/rules/header-keywords.rst
+++ b/doc/userguide/rules/header-keywords.rst
@@ -643,6 +643,11 @@ Example of icmp_seq in a rule:
 
     alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL SCAN Broadscan Smurf Scanner"; dsize:4; icmp_id:0; :example-rule-emphasis:`icmp_seq:0;` itype:8; classtype:attempted-recon; sid:2100478; rev:4;)
 
+icmpv4.hdr
+^^^^^^^^^^
+
+Sitcky buffer to match on the whole ICMPv4 header.
+
 icmpv6.hdr
 ^^^^^^^^^^