diff --git a/tools/cli/client/client.go b/tools/cli/client/client.go
index f5f240ca29..fd15939bba 100644
--- a/tools/cli/client/client.go
+++ b/tools/cli/client/client.go
@@ -35,6 +35,7 @@ import (
 	_ "github.com/apache/dubbo-go/tools/cli/protocol/dubbo"
 )
 
+// defaultBufferSize is the tcp read default buffer size
 const defaultBufferSize = 1024 * 1024 * 4
 
 // TelnetClient maintain a connection to target