LMOD-QuickReference-Guide.md

 The system now uses a combination of the LMOD module system and the EasyBuild automatic build framework. Although, largely compatible LMOD has some differences in usage and module names as documented below.
 
+#### Table of contents
+1. [Basics](#basics)
+    1. [Loading and unloading modules](#loading-and-unloading-modules)
+    2. [Searching modules](#searching-modules)
+    3. [Personal module collections](#personal-module-collections)
+2. [Core compiler](#core-compiler)
+3. [Toolchains](#toolchains)
+    1. [Existing toolchains](#existing-toolchains)
+4. [External Documentation](#external-documentation)
+
 ## Basics
 
 #### Loading and unloading modules