--- a/doc/doxygen.conf	Tue Jul 31 11:53:11 2007 +0100
+++ b/doc/doxygen.conf	Wed Sep 05 18:42:41 2007 +0100
@@ -1002,7 +1002,7 @@
 # undefined via #undef or recursively expanded use the := operator 
 # instead of the = operator.
 
-PREDEFINED             = RUN_SELF_TESTS NS3_DEBUG_ENABLE
+PREDEFINED             = RUN_SELF_TESTS NS3_DEBUG_ENABLE NS3_ASSERT_ENABLE
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 
 # this tag can be used to specify a list of macro names that should be expanded.