diff --git a/sat/core/constants.py b/sat/core/constants.py
index 3ea4b788..9a0daba1 100644
--- a/sat/core/constants.py
+++ b/sat/core/constants.py
@@ -425,7 +425,7 @@ class Const(object):
         )
 
     @classmethod
-    def bool(cls, value):
+    def bool(cls, value: str) -> bool:
         """@return (bool): bool value for associated constant"""
         assert isinstance(value, str)
         return value.lower() in (cls.BOOL_TRUE, "1", "yes", "on")