diff --git a/src/backend/search/search_service.py b/src/backend/search/search_service.py
index 504bb9e..54e16d6 100644
--- a/src/backend/search/search_service.py
+++ b/src/backend/search/search_service.py
@@ -78,7 +78,7 @@ def get_search_provider() -> SearchProvider:
         case _:
             raise HTTPException(
                 status_code=500,
-                detail="Invalid search provider. Please set the SEARCH_PROVIDER environment variable to either 'searxng' or 'tavily'.",
+                detail="Invalid search provider. Please set the SEARCH_PROVIDER environment variable to either 'searxng', 'tavily', 'serper', or 'bing'.",
             )