diff --git a/cron/scripts/ext_api_sync/dwd_api_sync.py b/cron/scripts/ext_api_sync/dwd_api_sync.py
index 900084af8a80b710e457706cadc4115cd2323d6f..427d579b87b5c4a2dc06549daa7fe6b15cc14d46 100755
--- a/cron/scripts/ext_api_sync/dwd_api_sync.py
+++ b/cron/scripts/ext_api_sync/dwd_api_sync.py
@@ -1,5 +1,7 @@
 #! /usr/bin/env python3
 
+# DWD Brightsky API docs: https://brightsky.dev/docs/#/operations/getWeather
+
 import requests
 import os
 import logging
diff --git a/cron/scripts/ext_api_sync/uba_api_sync.py b/cron/scripts/ext_api_sync/uba_api_sync.py
index 410afd96f170c8b96cbb67fd15e2e779d9ffdc36..aae108ac914549cfdc2f21674f48b7b16d266946 100644
--- a/cron/scripts/ext_api_sync/uba_api_sync.py
+++ b/cron/scripts/ext_api_sync/uba_api_sync.py
@@ -1,5 +1,7 @@
 #! /usr/bin/env python3
 
+# UBA API docs: https://www.umweltbundesamt.de/daten/luft/luftdaten/doc
+
 import requests
 import os
 import logging