DOC: added note for missing type checks

src/caosdb/utils/plantuml.py

@@ -111,6 +111,8 @@ def recordtypes_to_plantuml_string(iterable,
     - Inheritance of Properties is not rendered nicely at the moment.
     """
 
+    # TODO: This function needs a review of python type hints.
+
     classes = [el for el in iterable
                if isinstance(el, db.RecordType)]
     dependencies = {}