diff --git a/README.md b/README.md
index c3ad5bbb..2f527a67 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,8 @@ webSocket.setOnMessageCallback(
        const std::string& str,
        size_t wireSize,
        const ix::WebSocketErrorInfo& error,
-       const ix::WebSocketCloseInfo& closeInfo,
-       const ix::WebSocketHttpHeaders& headers)
+       const ix::WebSocketOpenInfo& openInfo,
+       const ix::WebSocketCloseInfo& closeInfo)
     {
         if (messageType == ix::WebSocket_MessageType_Message)
         {
@@ -292,8 +292,8 @@ webSocket.setOnMessageCallback(
        const std::string& str,
        size_t wireSize,
        const ix::WebSocketErrorInfo& error,
-       const ix::WebSocketCloseInfo& closeInfo,
-       const ix::WebSocketHttpHeaders& headers)
+       const ix::WebSocketOpenInfo& openInfo,
+       const ix::WebSocketCloseInfo& closeInfo)
     {
         if (messageType == ix::WebSocket_MessageType_Open)
         {
@@ -329,8 +329,8 @@ webSocket.setOnMessageCallback(
        const std::string& str,
        size_t wireSize,
        const ix::WebSocketErrorInfo& error,
-       const ix::WebSocketCloseInfo& closeInfo,
-       const ix::WebSocketHttpHeaders& headers)
+       const ix::WebSocketOpenInfo& openInfo,
+       const ix::WebSocketCloseInfo& closeInfo)
     {
         if (messageType == ix::WebSocket_MessageType_Error)
         {
@@ -369,8 +369,8 @@ webSocket.setOnMessageCallback(
        const std::string& str,
        size_t wireSize,
        const ix::WebSocketErrorInfo& error,
-       const ix::WebSocketCloseInfo& closeInfo,
-       const ix::WebSocketHttpHeaders& headers)
+       const ix::WebSocketOpenInfo& openInfo,
+       const ix::WebSocketCloseInfo& closeInfo)
     {
         if (messageType == ix::WebSocket_MessageType_Ping ||
             messageType == ix::WebSocket_MessageType_Pong)