Add few lines of comments. 
diff --git a/modules/transport/http/src/org/apache/axis2/transport/http/CommonsHTTPTransportSender.java b/modules/transport/http/src/org/apache/axis2/transport/http/CommonsHTTPTransportSender.java
index 4181a56..f0a123d 100644
--- a/modules/transport/http/src/org/apache/axis2/transport/http/CommonsHTTPTransportSender.java
+++ b/modules/transport/http/src/org/apache/axis2/transport/http/CommonsHTTPTransportSender.java
@@ -76,7 +76,12 @@
     private int soTimeout = HTTPConstants.DEFAULT_SO_TIMEOUT;
 
     private int connectionTimeout = HTTPConstants.DEFAULT_CONNECTION_TIMEOUT;
-
+    
+    /*
+     * It's Required to keep this method to keep backward compatibility because
+     * still it's possible to register CommonsHTTPTransportSender in the
+     * axis2.xml.
+     */
     public void cleanup(MessageContext msgContext) throws AxisFault {
         
             HttpMethod httpMethod = (HttpMethod) msgContext.getProperty(HTTPConstants.HTTP_METHOD);