diff --git a/src/pydase/data_service/data_service_observer.py b/src/pydase/data_service/data_service_observer.py
index aeabfef..ef4e85d 100644
--- a/src/pydase/data_service/data_service_observer.py
+++ b/src/pydase/data_service/data_service_observer.py
@@ -44,6 +44,8 @@ class DataServiceObserver(PropertyObserver):
 
         self._update_cache_value(full_access_path, value, cached_value_dict)
 
+        # TODO: get the cached value again -> _update_cache_value already put the
+        # right thing into the cache
         for callback in self._notification_callbacks:
             callback(full_access_path, value, cached_value_dict)
 
diff --git a/src/pydase/utils/serializer.py b/src/pydase/utils/serializer.py
index 32b30ce..4f136f8 100644
--- a/src/pydase/utils/serializer.py
+++ b/src/pydase/utils/serializer.py
@@ -273,6 +273,8 @@ def set_nested_value_by_path(
     value_type = serialized_value.pop("type")
     if "readonly" in current_dict and current_dict["type"] != "method":
         current_dict["type"] = value_type
+    # TODO: this does not yet remove keys that are not present in the serialized new
+    # value
     current_dict.update(serialized_value)