diff --git a/configs/advanced/query_node.yaml b/configs/advanced/query_node.yaml
index e4e6a1ffd4..865c871dfb 100644
--- a/configs/advanced/query_node.yaml
+++ b/configs/advanced/query_node.yaml
@@ -20,11 +20,11 @@ queryNode:
 
   msgStream:
     search:
-      recvBufSize: 512
-      pulsarBufSize: 512
+      recvBufSize: 512 # msgPack channel buffer size
+      pulsarBufSize: 512 # pulsar channel buffer size
 
     searchResult:
-      recvBufSize: 64
+      recvBufSize: 64 # msgPack channel buffer size
 
   segcore:
     chunkRows: 32768