diff --git a/configs/iax.conf.sample b/configs/iax.conf.sample
index 724b719522..09001ea9f6 100755
--- a/configs/iax.conf.sample
+++ b/configs/iax.conf.sample
@@ -18,8 +18,12 @@
 ;                               ; addresses, but the first will be the 
 ;                               ; default
 ;
-; Set iaxcompat to yes if you plan to use layered 
-; switches.  It incurs a small performance hit to enable it
+; Set iaxcompat to yes if you plan to use layered switches or
+; some other scenario which may cause some delay when doing a
+; lookup in the dialplan. It incurs a small performance hit to
+; enable it. This option causes Asterisk to spawn a separate thread
+; when it receives an IAX DPREQ (Dialplan Request) instead of
+; blocking while it waits for a response.
 ;
 ;iaxcompat=yes
 ;