diff --git a/src/kestrel/exceptions.py b/src/kestrel/exceptions.py
index 3f8bbff5..12e9f2dd 100644
--- a/src/kestrel/exceptions.py
+++ b/src/kestrel/exceptions.py
@@ -198,7 +198,7 @@ def __init__(self, uri, itf, msg=""):
 class DataSourceError(KestrelException):
     def __init__(self, error, suggestion=""):
         if not suggestion:
-            suggestion = "please check data source config or test the query manually"
+            suggestion = "please check data source config or diagnose with stix-shifter-diag command"
         super().__init__(
             error,
             suggestion,