diff --git a/i3pystatus/core/settings.py b/i3pystatus/core/settings.py
index b2d6e3d..e84fd3f 100644
--- a/i3pystatus/core/settings.py
+++ b/i3pystatus/core/settings.py
@@ -30,7 +30,7 @@ class SettingsBaseMeta(type):
             settings += tuple(getattr(base, "settings", []))
             required |= set(getattr(base, "required", []))
         # if a derived class defines a default for a setting it is not
-        # required anymore.
+        # required anymore, provided that default is not set to None.
         for base in inspect.getmro(cls):
             for r in list(required):
                 if hasattr(base, r) and getattr(base, r) != getattr(cls, r) \