diff --git a/config/config2.example.yaml b/config/config2.example.yaml
index 6d1148a85..e57ec3ee8 100644
--- a/config/config2.example.yaml
+++ b/config/config2.example.yaml
@@ -18,7 +18,7 @@ embedding:
   model: ""
   api_version: ""
   embed_batch_size: 100
-  dimensions: 
+  dimensions: # output dimension of embedding model
 
 repair_llm_output: true  # when the output is not a valid json, try to repair it