--- a/doc/build.txt	Mon Jul 16 22:49:48 2007 -0700
+++ b/doc/build.txt	Wed Jul 18 11:43:39 2007 +0100
@@ -60,6 +60,15 @@
     before running the program.  Note: the "program [args]" string is
     parsed using POSIX shell rules.
 
+ 4.1 waf --run programname --command-template "... %s ..."
+
+    Same as --run, but uses a command template with %s replaced by the
+    actual program (whose name is given by --run).  This can be use to
+    run ns-3 programs with helper tools.  For example, to run unit
+    tests with valgrind, use the command:
+
+         waf --run run-tests --command-template "valgrind %s"
+
  5. waf --shell
     Starts a nested system shell with modified environment to run ns3 programs.