diff --git a/doc/userguide/rules/tls-keywords.rst b/doc/userguide/rules/tls-keywords.rst
index 3f371f571b..e8220c6487 100644
--- a/doc/userguide/rules/tls-keywords.rst
+++ b/doc/userguide/rules/tls-keywords.rst
@@ -15,6 +15,8 @@ Examples::
 
 ``tls_cert_subject`` is a 'Sticky buffer'.
 
+``tls_cert_subject`` can be used as ``fast_pattern``.
+
 tls_cert_issuer
 ---------------
 
@@ -27,6 +29,8 @@ Examples::
 
 ``tls_cert_issuer`` is a 'Sticky buffer'.
 
+``tls_cert_issuer`` can be used as ``fast_pattern``.
+
 tls_sni
 -------
 
@@ -39,6 +43,8 @@ Examples::
 
 ``tls_sni`` is a 'Sticky buffer'.
 
+``tls_sni`` can be used as ``fast_pattern``.
+
 tls_cert_notbefore
 ------------------