diff --git a/interface/type b/interface/type
index a605f4cd4..ae24f5cc1 100644
--- a/interface/type
+++ b/interface/type
@@ -12,6 +12,9 @@ Type
 		Parameterized
 			baseType : SimpleType
 			typeArguments: Type*
+	Constant
+		baseType: Type
+		value: String
 	Annotated
 		baseType : SimpleType
 		annotations : Annotation*