doc: add missing documentation for ipv6.hdr keyword

diff --git a/doc/userguide/rules/header-keywords.rst b/doc/userguide/rules/header-keywords.rst
index e04f5119cfaaa26ec73dd961aa183c6b358fa573..192d2f5733b2b6e85f07bf62a4f0558d37aad155 100644 (file)
--- a/doc/userguide/rules/header-keywords.rst
+++ b/doc/userguide/rules/header-keywords.rst
@@ -111,6 +111,11 @@ The named variant of that example would be::
 
     ip_proto:PIM
 
+ipv6.hdr
+^^^^^^^^
+
+Sticky buffer to match on the whole IPv6 header.
+
 id
 ^^