Update example_genomics.rst

docs/user_guide/example_genomics.rst

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 Setup of an Example Site
 =================================
 
-The following tutorial will walk you through creating content and loading genomic data. This is a good introduction to Tripal v3.x Content Types and the new Administrative User Interface regardless of whether you intend to store genomic data in your particular Tripal v3 site.
+The following tutorial will walk you through creating content and loading genomic data. This is a good introduction to Tripal v3.x Content Types and the new Administrative User Interface regardless of whether you intend to store genomic data in your particular Tripal v3 site.  This demonstration uses three extension modules:  `Tripal Analysis Blast <https://github.com/tripal/tripal_analysis_blast>`_, `Tripal Analysis KEGG <https://github.com/tripal/tripal_analysis_kegg>`_, and `Tripal Analysis InterPro <https://github.com/tripal/tripal_analysis_interpro>`_.  
+
+.. note:: 
+
+  As a rule, extension modules are not documented in the Tripal User's Guide.  You can find documentation for extension modules that enhance Tripal functionality on the :doc:`../extensions` page.  However, to provide a functioning demonstration the three analysis extension modules are described here. 
 
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