f0e3124182a84a61e850b3db8954dc120b04c82d
kuhn
  Fri Nov 5 20:24:10 2021 -0700
added link to Definition Document at top of page to make it more obvious

diff --git src/hg/htdocs/goldenPath/help/hgTrackHubHelp.html src/hg/htdocs/goldenPath/help/hgTrackHubHelp.html
index 4d1e5a5..4e47416 100755
--- src/hg/htdocs/goldenPath/help/hgTrackHubHelp.html
+++ src/hg/htdocs/goldenPath/help/hgTrackHubHelp.html
@@ -8,30 +8,32 @@
 <h1>Using UCSC Genome Browser Track Hubs</strong></h1>
 
 <h2>Contents</h2>
 
 <h6><a href="#Intro">What Are Track Hubs?</a></h6> 
 <h6><a href="#Assembly">What Are Assembly Hubs?</a></h6>
 <h6><a href="#View">Viewing Track Hubs</a></h6>
 <h6><a href="#Sharing">Sharing Track Hubs</a></h6>
 <h6><a href="#Setup">Setting up a Track Hub</a></h6>
 <h6><a href="#Debug">Debugging Track Hubs</a></h6>
 <h6><a href="#Search">Setting up item search</a></h6>
 <h6><a href="#Filters">Adding filters to your Track Hub</a></h6>
 <h6><a href="#Register">Registering a Track Hub with UCSC</a></h6>
 <h6><a href="#Compatibility">Checking Hub settings and compatibility</a></h6>
 <h6><a href="#Hosting">Where to host your data</a></h6>
+<h6><a href="https://genome.ucsc.edu/goldenPath/help/trackDb/trackDbHub.html"
+      target = _blank>Track Hub Database Definition Document</a></h6>
 <hr>
 <p>
 <strong>Additional resources</strong></p> 
 <ul>
   <li>Raney BJ, et al. <a href="https://doi.org/10.1093/bioinformatics/btt637"
   target="_blank">Track Data Hubs enable visualization of user-defined genome-wide annotations on 
   the UCSC Genome Browser</a>. <em>Bioinformatics</em>. 2014 Apr 1;30(7):1003-5. 
   <li> 
   <a href="http://genomewiki.ucsc.edu/index.php/Assembly_Hubs" target="_blank">Assembly Hubs 
   Wiki</a></li> 
   <li>
   <a href="trackDb/trackDbHub.html" target="_blank">Track Database Definition Document</a> 
   (Reference guide for trackDb parameter definitions)</li> 
   <li>
   <a href="http://genomewiki.ucsc.edu/index.php/Public_Hub_Guidelines" target="_blank">Public Hub