--- a/doc/tutorial/source/tweaking.rst	Thu Dec 04 10:02:36 2014 -0800
+++ b/doc/tutorial/source/tweaking.rst	Thu Dec 04 10:03:07 2014 -0800
@@ -5,6 +5,8 @@
 Tweaking
 --------
 
+.. _UsingLogging:
+
 Using the Logging Module
 ************************
 
@@ -412,6 +414,8 @@
 Using Command Line Arguments
 ****************************
 
+.. _Attribute:
+
 Overriding Default Attributes
 +++++++++++++++++++++++++++++
 Another way you can change how |ns3| scripts behave without editing
@@ -722,6 +726,8 @@
 command line system.  If you are a script author, you can add new variables to 
 your scripts and hook them into the command line system quite painlessly.
 
+.. _UsingTracingSystem:
+
 Using the Tracing System
 ************************