diff --git a/configs/extensions.conf.sample b/configs/extensions.conf.sample
index e9dda616166181204a066743ed9a6ef958140836..f45a39df3abec63d5b8603e71dc097ad4c3779f4 100644
--- a/configs/extensions.conf.sample
+++ b/configs/extensions.conf.sample
@@ -206,6 +206,12 @@ include => dundi-e164-switch
 ;
 ; ARG1 is the extension to Dial
 ;
+; Extension "s" is not a wildcard extension that matches "anything".
+; In macros, it is the start extension. In most other cases, 
+; you have to goto "s" to execute that extension.
+;
+; For wildcard matches, see above - all pattern matches start with
+; an underscore.
 exten => s,1,Goto(${ARG1},1)
 include => dundi-e164-lookup