diff --git a/src/lib.ts b/src/lib.ts
index c91dd93..cd756f1 100644
--- a/src/lib.ts
+++ b/src/lib.ts
@@ -57,7 +57,7 @@ class TunnelResponse extends stream.Duplex {
     super();
 
     if (duplex) {
-      // for websocket request： bidirection
+      // for websocket request: bidirection
       const onResponsePipe = (responseId: string, data: any) => {
         if (this.responseId === responseId) {
           this.push(data);