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diff --git a/1.4.23-rc4/doc/model.txt b/1.4.23-rc4/doc/model.txt
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-Description of call model:
-
-Incoming Call:
-
-	Channel backend waits for a RING or equivalent on some sort of
-interface. Typically this is done in its own thread.  When a RING is
-detected, the backend should create a channel structure and then call
-ast_pbx_start() on that channel, which will create a thread to monitor
-that interface.  At this point, the PBX and/or applications it launches
-will manage the interface, and it need not be monitored by the
-aforementioned thread.  When the applications are finished, the requisite
-hangup function will be called, at which the channel can be considered to
-be no longer valid, and the thread that controls it will imminently be
-terminated. 
-