--- a/configmix/config.py	Wed Nov 10 02:43:23 2021 +0100
+++ b/configmix/config.py	Wed Nov 10 09:37:44 2021 +0100
@@ -111,6 +111,9 @@
         If the path item is a `list` or `tuple` then the namespace is assumed
         to be `None`.
 
+        Note that a caller that wants to use variables from a non-default
+        namespace must use a sequence of dicts.
+
         No variable interpolation is done and no filters are applied.
 
         Quoting of anything in `paths` is *not* needed and wrong.