diff --git a/wren-ai-service/.env.dev.example b/wren-ai-service/.env.dev.example
index 85e1ba72e..a15ca71db 100644
--- a/wren-ai-service/.env.dev.example
+++ b/wren-ai-service/.env.dev.example
@@ -53,16 +53,19 @@ WREN_UI_ENDPOINT=http://localhost:3000
 ## when using wren_ibis as the engine
 WREN_IBIS_ENDPOINT=http://localhost:8000
 WREN_IBIS_SOURCE=bigquery
-WREN_IBIS_MANIFEST= # this is a base64 encoded string of the MDL
-WREN_IBIS_CONNECTION_INFO= # this is a base64 encode string of the connection info
+### this is a base64 encoded string of the MDL
+WREN_IBIS_MANIFEST= 
+### this is a base64 encode string of the connection info
+WREN_IBIS_CONNECTION_INFO=e30= 
 
-# evaluation related
+# Evaluation
 DATASET_NAME=book_2
 
-ENABLE_TIMER=
-LOGGING_LEVEL=INFO
-
-LANGFUSE_ENABLE=
+LANGFUSE_ENABLE=false
 LANGFUSE_SECRET_KEY=
 LANGFUSE_PUBLIC_KEY=
 LANGFUSE_HOST=https://cloud.langfuse.com
+
+# Debugging
+ENABLE_TIMER=
+LOGGING_LEVEL=DEBUG
\ No newline at end of file