diff --git a/sloth/core/exceptions.py b/sloth/core/exceptions.py
index 5a32282..d820040 100644
--- a/sloth/core/exceptions.py
+++ b/sloth/core/exceptions.py
@@ -5,3 +5,7 @@ Label tool exception classes.
 class ImproperlyConfigured(Exception):
     """There is an error in the configuration."""
     pass
+
+class NotImplementedException(Exception):
+    """This function/method/class has not been implemented yet."""
+    pass