diff --git a/contrib/drivers/mssql/mssql_z_unit_basic_test.go b/contrib/drivers/mssql/mssql_z_unit_basic_test.go
index 9933f751c..49635776d 100644
--- a/contrib/drivers/mssql/mssql_z_unit_basic_test.go
+++ b/contrib/drivers/mssql/mssql_z_unit_basic_test.go
@@ -148,7 +148,7 @@ func TestDoInsert(t *testing.T) {
 		_, err := db.Save(context.Background(), "t_user", data, 10)
 		gtest.AssertNE(err, nil)
 
-		// Replace should now work (it will auto-detect primary key)
+		// Replace should fail because primary key 'id' is not in the data
 		_, err = db.Replace(context.Background(), "t_user", data, 10)
 		gtest.AssertNE(err, nil)
 	})