diff --git a/catalogue/__init__.py b/catalogue/__init__.py
index 32490bd..6fa2354 100644
--- a/catalogue/__init__.py
+++ b/catalogue/__init__.py
@@ -99,9 +99,8 @@ def get(self, name: str) -> Any:
         return _get(namespace)
 
     def get_all(self) -> Dict[str, Any]:
-        """Get a all functions for a given namespace.
+        """Get all functions for a given namespace.
 
-        namespace (Tuple[str]): The namespace to get.
         RETURNS (Dict[str, Any]): The functions, keyed by name.
         """
         global REGISTRY