--- a/doc/tutorial/source/building-topologies.rst	Sat May 11 13:27:05 2013 -0700
+++ b/doc/tutorial/source/building-topologies.rst	Sun May 12 11:46:51 2013 -0700
@@ -1326,7 +1326,8 @@
 trace source to originate the trace events.  We will need to write a trace 
 sink to connect to that source that will display some pretty information for 
 us.  Despite its reputation as being difficult, it's really quite simple.
-Just before the main program of the ``scratch/mythird.cc`` script, add the 
+Just before the main program of the ``scratch/mythird.cc`` script (i.e.,
+just after the ``NS_LOG_COMPONENT_DEFINE`` statement), add the 
 following function:
 
 ::