diff --git a/src/mod/applications/mod_dptools/mod_dptools.c b/src/mod/applications/mod_dptools/mod_dptools.c
index 97f4f6bcf1..b99522a4c4 100644
--- a/src/mod/applications/mod_dptools/mod_dptools.c
+++ b/src/mod/applications/mod_dptools/mod_dptools.c
@@ -1944,7 +1944,7 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_dptools_load)
 	SWITCH_ADD_APP(app_interface, "unhold", "Send a un-hold message", "Send a un-hold message", unhold_function, UNHOLD_SYNTAX, SAF_SUPPORT_NOMEDIA);
 	SWITCH_ADD_APP(app_interface, "transfer", "Transfer a channel", TRANSFER_LONG_DESC, transfer_function, "<exten> [<dialplan> <context>]", SAF_SUPPORT_NOMEDIA);
 	SWITCH_ADD_APP(app_interface, "check_acl", "Check an ip against an ACL list", 
-				   "Check an ip against an ACL list", check_acl_function, "<ip> <acl | cidr>", SAF_SUPPORT_NOMEDIA);
+				   "Check an ip against an ACL list", check_acl_function, "<ip> <acl | cidr> [<hangup_cause>]", SAF_SUPPORT_NOMEDIA);
 	SWITCH_ADD_APP(app_interface, "sleep", "Pause a channel", SLEEP_LONG_DESC, sleep_function, "<pausemilliseconds>", SAF_SUPPORT_NOMEDIA);
 	SWITCH_ADD_APP(app_interface, "delay_echo", "echo audio at a specified delay", "Delay n ms", delay_function, "<delay ms>", SAF_NONE);
 	SWITCH_ADD_APP(app_interface, "strftime", NULL, NULL, strftime_function, NULL, SAF_SUPPORT_NOMEDIA);