--- a/src/core/model/unix-fd-reader.cc	Wed Dec 17 12:17:11 2014 -0800
+++ b/src/core/model/unix-fd-reader.cc	Thu Dec 18 15:12:35 2014 -0800
@@ -21,7 +21,7 @@
 
 #include <cerrno>
 #include <cstring>
-#include <unistd.h>
+#include <unistd.h>  // close()
 #include <fcntl.h>
 
 #include "log.h"
@@ -32,6 +32,12 @@
 
 #include "unix-fd-reader.h"
 
+/**
+ * \file
+ * \ingroup system
+ * ns3::FdReader implementation.
+ */
+
 namespace ns3 {
 
 NS_LOG_COMPONENT_DEFINE ("FdReader");