--- a/src/internet-node/ipv4-l3-protocol.h	Mon Apr 14 16:06:08 2008 -0700
+++ b/src/internet-node/ipv4-l3-protocol.h	Mon Apr 14 16:06:44 2008 -0700
@@ -41,6 +41,9 @@
 class Node;
 
 
+/**
+ * \brief Implement the Ipv4 layer.
+ */
 class Ipv4L3Protocol : public Object
 {
 public: