Add a comment about the MEDIA_STORAGE_BACKEND hash

playbooks/roles/programs/defaults/main.yml

@@ -134,6 +134,8 @@ PROGRAMS_SERVICE_CONFIG:
   PUBLIC_URL_ROOT: '{{ PROGRAMS_URL_ROOT }}'
   ORGANIZATIONS_API_URL_ROOT: '{{ PROGRAMS_ORGANIZATIONS_API_URL_ROOT }}'
   
+  # This hash contains top-level Django settings and must be unpacked
+  # when loading/overriding settings.
   MEDIA_STORAGE_BACKEND: '{{ PROGRAMS_MEDIA_STORAGE_BACKEND }}'
   
   JWT_AUTH: '{{ PROGRAMS_JWT_AUTH }}'