transport: Remove unused member elementListener_.
diff --git a/include/ndn-cpp/transport/transport.hpp b/include/ndn-cpp/transport/transport.hpp
index 3be3dd3..5a23027 100644
--- a/include/ndn-cpp/transport/transport.hpp
+++ b/include/ndn-cpp/transport/transport.hpp
@@ -48,8 +48,8 @@
/**
* Process any data to receive. For each element received, call elementListener.onReceivedElement.
- * This is non-blocking and will silently time out after a brief period if there is no data to receive.
- * You should repeatedly call this from an event loop.
+ * This is non-blocking and will return immediately if there is no data to receive.
+ * You should normally not call this directly since it is called by Face.processEvents.
* @throw This may throw an exception for reading data or in the callback for processing the data. If you
* call this from an main event loop, you may want to catch and log/disregard all exceptions.
*/