diff --git a/src/modules/topos/doc/topos_admin.xml b/src/modules/topos/doc/topos_admin.xml
index dcf61a0fed6..82e7c1e45eb 100644
--- a/src/modules/topos/doc/topos_admin.xml
+++ b/src/modules/topos/doc/topos_admin.xml
@@ -57,6 +57,12 @@
 				for topology stripping and restoring.
 			</para>
 			</listitem>
+			<listitem>
+			<para>
+				<emphasis>topoh module</emphasis> - in case of Call-ID mask
+				for Call-ID masking.
+			</para>
+			</listitem>
 			</itemizedlist>
 		</para>
 	</section>
@@ -130,14 +136,14 @@ modparam("topos", "db_url", "&exampledb;")
 	<section id="topos.p.mask_callid">
 		<title><varname>mask_callid</varname> (int)</title>
 		<para>
-			Note: this functionality is not implemented yet - the
-			parameter is present in order to be in pair with topoh
-			module.
-		</para>
-		<para>
-			Whether to replace or not the Call-ID with another
-			unique id generated by &kamailio;.
+			Whether to encode the Call-id: header. Some SIP extensions include
+			the Call-id in the SIP message payload or header, so it is safe to
+			not encode Call-id in such cases. Well-known extensions such as
+			call transfer or conference join will be added to work with encoded
+			Call-id.
+			Topoh module should be loaded with use_mode paramerter set to 1
 		</para>
+		
 		<para>
 		<emphasis>
 			Default value is 0 (do not mask).