diff --git a/opentrafficshaper/plugins/configmanager.pm b/opentrafficshaper/plugins/configmanager.pm
index aa80af132d04432b0525b24ba644da4a84179814..bad57590e80a42c58bc08280a69df67041ba50be 100644
--- a/opentrafficshaper/plugins/configmanager.pm
+++ b/opentrafficshaper/plugins/configmanager.pm
@@ -86,6 +86,9 @@ our (@ISA,@EXPORT,@EXPORT_OK);
 
 	getTrafficDirection
 
+	isInterfaceIDValid
+	isGroupIDValid
+
 	getInterface
 	getInterfaces
 	getInterfaceTrafficClasses