Update index.md

Author: ocaisa

docs/data/index.md

@@ -10,7 +10,8 @@ This page is automatically updated to provide the most versions and descriptions
 ## Raw YAML data
 
 The raw yaml data is a large complex object, primarily used as the source of truth for the json
-data generation scripts. The file is generated automatically in CI.
+data generation scripts. The file is generated automatically in CI and therefore only available in
+the webpage generated by the repository ([eessi.io/api_data](https://www.eessi.io/api_data/)).
 
 - [eessi_software_metadata.yaml](eessi_software_metadata.yaml)