diff --git a/src/main/java/com/nhn/pinpoint/profiler/sender/TcpDataSender.java b/src/main/java/com/nhn/pinpoint/profiler/sender/TcpDataSender.java
index 8641a718a..5e59f0726 100644
--- a/src/main/java/com/nhn/pinpoint/profiler/sender/TcpDataSender.java
+++ b/src/main/java/com/nhn/pinpoint/profiler/sender/TcpDataSender.java
@@ -30,6 +30,7 @@ public class TcpDataSender extends AbstractDataSender implements EnhancedDataSen
 
     private final Logger logger = LoggerFactory.getLogger(this.getClass());
     static {
+        // preClassLoad
         ChannelBuffers.buffer(2);
     }