Index: misdn.txt
===================================================================
--- misdn.txt	(revision 162013)
+++ misdn.txt	(working copy)
@@ -135,7 +135,7 @@
 The dial string of chan_misdn got more complex, because we added more features,
 so the generic dial string looks like:
 
-mISDN/<port>|g:<group>/<extension>[/<OPTIONSSTRING>]
+mISDN/<port>[:bchannel]|g:<group>/<extension>[/<OPTIONSSTRING>]
 
 The Optionsstring looks Like:
 :<optchar><optarg>:<optchar><optarg>...