diff --git a/configs/zapata.conf.sample b/configs/zapata.conf.sample
index 78e03c2acd..5d6d0d4d31 100755
--- a/configs/zapata.conf.sample
+++ b/configs/zapata.conf.sample
@@ -131,6 +131,10 @@ switchtype=national
 ; pritimer => t200,1000
 ; pritimer => t313,4000
 ;
+; To enable transmission of facility-based ISDN supplementary services (such
+; as caller name from CPE over facility) enable this option.
+; facilityenable = yes
+;
 ;
 ; Signalling method (default is fxs).  Valid values:
 ; em:      E & M