diff --git a/pyzipline/exceptions.py b/pyzipline/exceptions.py
index 6ef9711..a889c2b 100644
--- a/pyzipline/exceptions.py
+++ b/pyzipline/exceptions.py
@@ -4,16 +4,18 @@ class HTTPFailure(Exception):
     """
     Raised when an HTTP request fails.
     """
-    pass
+
+class Forbidden(Exception):
+    """
+    Raised when the authenticated user does not have the ability to do an action.
+    """
 
 class PyZiplineError(Exception):
     """
     Raised when an error occurs in the PyZipline library.
     """
-    pass
 
 class FeatureDisabledError(Exception):
     """
     Raised when a feature is disabled on the Zipline instance.
     """
-    pass