diff --git a/conf/config-default.yaml b/conf/config-default.yaml
index 589552dcb834..dc77ae5509e9 100755
--- a/conf/config-default.yaml
+++ b/conf/config-default.yaml
@@ -584,16 +584,16 @@ plugin_attr:          # Plugin attributes
       ip: 127.0.0.1                         # Set the IP.
       port: 9091                            # Set the port.
     # metrics:    # Create extra labels from nginx variables: https://nginx.org/en/docs/varindex.html
-    #   http_status:
-    #     extra_labels:
-    #       - upstream_addr: $upstream_addr
-    #       - status: $upstream_status  # The label name does not need to be the same as the variable name.
-    #   http_latency:
-    #     extra_labels:
-    #       - upstream_addr: $upstream_addr
-    #   bandwidth:
-    #     extra_labels:
-    #       - upstream_addr: $upstream_addr
+    #  http_status:
+    #    extra_labels:
+    #      - upstream_addr: $upstream_addr
+    #      - status: $upstream_status  # The label name does not need to be the same as the variable name.
+    #  http_latency:
+    #    extra_labels:
+    #      - upstream_addr: $upstream_addr
+    #  bandwidth:
+    #    extra_labels:
+    #      - upstream_addr: $upstream_addr
     # default_buckets:
     #   - 10
     #   - 50