diff -r 09b539910969 src/internet-stack/ipv4-l3-protocol.cc
--- a/src/internet-stack/ipv4-l3-protocol.cc    Mon Oct 05 15:32:12 2009 +0100
+++ b/src/internet-stack/ipv4-l3-protocol.cc    Mon Oct 05 22:08:56 2009 -0700
@@ -70,11 +70,11 @@
                    MakeObjectVectorAccessor (&Ipv4L3Protocol::m_interfaces),
                    MakeObjectVectorChecker<Ipv4Interface> ())
 
-    .AddTraceSource ("SendOutgoing", "A newly-generated by this node ipv4 packet is about to be queued for transmission",
+    .AddTraceSource ("SendOutgoing", "A newly-generated packet by this node is about to be queued for transmission",
                      MakeTraceSourceAccessor (&Ipv4L3Protocol::m_sendOutgoingTrace))
-    .AddTraceSource ("UnicastForward", "A unicast ipv4 packet was received by this node and is being forwarded to another node",
+    .AddTraceSource ("UnicastForward", "A unicast IPv4 packet was received by this node and is being forwarded to another node",
                      MakeTraceSourceAccessor (&Ipv4L3Protocol::m_unicastForwardTrace))
-    .AddTraceSource ("LocalDeliver", "An ipv4 packet was received by/for this node, and it is being forward up the stack",
+    .AddTraceSource ("LocalDeliver", "An IPv4 packet was received by/for this node, and it is being forward up the stack",
                      MakeTraceSourceAccessor (&Ipv4L3Protocol::m_localDeliverTrace))
 
     ;
diff -r 09b539910969 src/internet-stack/ipv4-l3-protocol.h
--- a/src/internet-stack/ipv4-l3-protocol.h     Mon Oct 05 15:32:12 2009 +0100
+++ b/src/internet-stack/ipv4-l3-protocol.h     Mon Oct 05 22:08:56 2009 -0700
@@ -239,6 +239,7 @@
   TracedCallback<const Ipv4Header &, Ptr<const Packet>, uint32_t> m_unicastForwardTrace;
   TracedCallback<const Ipv4Header &, Ptr<const Packet>, uint32_t> m_localDeliverTrace;
 
+  // The following two traces pass a packet with an IP header
   TracedCallback<Ptr<const Packet>, uint32_t> m_txTrace;
   TracedCallback<Ptr<const Packet>, uint32_t> m_rxTrace;
   // <ip-header, payload, reason, ifindex> (ifindex not valid if reason is DROP_NO_ROUTE)