diff --git a/doc/manuals/chapters/mgcp_extensions.adoc b/doc/manuals/chapters/mgcp_extensions.adoc
index a68d7855f..df314bcfb 100644
--- a/doc/manuals/chapters/mgcp_extensions.adoc
+++ b/doc/manuals/chapters/mgcp_extensions.adoc
@@ -66,3 +66,7 @@ m=audio 5904 RTP/AVP 97
 a=rtpmap:97 GSM-EFR/8000
 a=ptime:40
 ----
+
+=== `X-Osmux`
+
+See <<mgcp-extension-osmux>>
diff --git a/doc/manuals/osmomgw-usermanual.adoc b/doc/manuals/osmomgw-usermanual.adoc
index b0bc83d79..0c2644975 100644
--- a/doc/manuals/osmomgw-usermanual.adoc
+++ b/doc/manuals/osmomgw-usermanual.adoc
@@ -20,6 +20,8 @@ include::{srcdir}/chapters/configuration.adoc[]
 
 include::{srcdir}/chapters/mgcp_extensions.adoc[]
 
+include::./common/chapters/osmux/osmux.adoc[]
+
 //include::{srcdir}/chapters/counters.adoc[]
 
 include::./common/chapters/port_numbers.adoc[]
@@ -29,5 +31,3 @@ include::./common/chapters/bibliography.adoc[]
 include::./common/chapters/glossary.adoc[]
 
 include::./common/chapters/gfdl.adoc[]
-
-