diff --git a/xep-0016.xml b/xep-0016.xml
index 390b3eaa..dde19cd7 100644
--- a/xep-0016.xml
+++ b/xep-0016.xml
@@ -78,6 +78,7 @@
 </header>
 <section1 topic="Introduction">
   <p>Almost all types of Instant Messaging (IM) applications have found it necessary to develop some method for a user to block the receipt of messages and packets from other users (the rationale for such blockage depends on the needs of the individual user). This document defines a flexible method for communications blocking.</p>
+  <p>Note: The protocol specified herein MAY be used in conjunction with &xep0191;; see <cite>XEP-0191</cite> for details.</p>
   <p><em>The remainder of this document has been copied without modification from Section 10 of &rfc3921;.</em></p>
 </section1>