diff --git a/openbsc/doc/channel_release.txt b/openbsc/doc/channel_release.txt
index bd707b4..c9cdfeb 100644
--- a/openbsc/doc/channel_release.txt
+++ b/openbsc/doc/channel_release.txt
@@ -61,7 +61,8 @@
 	* Release all SAPI's > 0 as local end (The BTS should send a
 	  REL_CONF a message)
 	* Send SACH Deactivate on SAPI=0 if required.
-	* It should start T3109 but it does not.
+	* Start T3109 (stop it when the main signalling link is disconnected)
+	  or when the channel released. On timeout start the error handling.
 	* abis_rsl.c schedules the RSL_MT_RF_CHAN_REL once all SAPI's are
 	  released and after T3111 has timed out or there is an error.