diff --git a/lostplaces/lostplaces_app/static/maps/source_files_tmp.txt b/lostplaces/lostplaces_app/static/maps/source_files_tmp.txt
new file mode 100644
index 0000000..deb4657
--- /dev/null
+++ b/lostplaces/lostplaces_app/static/maps/source_files_tmp.txt
@@ -0,0 +1,6 @@
+# Keeping these files up-to-date is something for CI / release management.
+# But for now I noted the source urls down here for later reference.
+
+https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.3.1/css/ol.css
+https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.3.1/build/ol.js
+https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.3.1/build/ol.js.map