diff --git a/photoprism/config.json b/photoprism/config.json
index e54878d5b..2bd496b05 100644
--- a/photoprism/config.json
+++ b/photoprism/config.json
@@ -88,6 +88,7 @@
     "ORIGINALS_PATH": "str",
     "STORAGE_PATH": "str",
     "UPLOAD_NSFW": "bool",
+    "graphic_drivers": "list(|mesa)?",
     "certfile": "str",
     "cifspassword": "str?",
     "cifsusername": "str?",