4a87b1269ea7ed40e2904c15bafda61f62d4f567
mspeir
  Wed Jan 7 11:33:28 2026 -0800
Adding information about include statements to hub docs, refs #20909

diff --git src/hg/htdocs/goldenPath/help/trackDb/trackDbHub.v3.html src/hg/htdocs/goldenPath/help/trackDb/trackDbHub.v3.html
index cc56ea73716..d6b5a81af4d 100755
--- src/hg/htdocs/goldenPath/help/trackDb/trackDbHub.v3.html
+++ src/hg/htdocs/goldenPath/help/trackDb/trackDbHub.v3.html
@@ -152,30 +152,37 @@
 
 <h3 id="useOneFile">Use <b><code>useOneFile on</code></b> for hubs with only one genome</h3>
 <p>
 This page focuses on the settings found in the <a target="_blank"
 href="../hgTrackHubHelp.html#trackDb.txt"><code>trackDb.txt</code></a> file;
 however, all hubs must include a top-level <a target="_blank"
 href="../hgTrackHubHelp.html#hub.txt"><code>hub.txt</code></a>.
 If your hub is only displaying one genome, there is a way to put the <a target="_blank"
 href="../hgTrackHubHelp.html#genomes.txt"><code>genomes.txt</code></a> and
 <a target="_blank" href="../hgTrackHubHelp.html#trackDb.txt"><code>trackDb.txt</code></a>
 all into one file. Read about the special <a target="_blank"
 href="../hgTracksHelp.html#UseOneFile"><code>useOneFile on</code></a> setting to
 allow all a hub to exist in one file. Load a working example <a target="_blank"
 href="../examples/hubExamples/hubUseOneFile/singleFileHubExample.txt">here</a>.</p>
 
+<h3 id="includes">Using trackDb include statements</h3>
+<p>
+Hubs also support the use of <a href="../hgTrackHubHelp.html#Includes">include
+statements</a>, allowing one to insert a file containing a set of trackDb
+stanzas into a primary trackDb. Use this when you have the same track across
+several assemblies, or several large, complex tracks.
+
 <h3 id="assembly_hubs">Assembly Hubs</h3>
 <p>
 This page focuses on the settings found in the <a target="_blank"
 href="../hgTrackHubHelp.html#trackDb.txt"><code>trackDb.txt</code></a> file used in
 both Track Hubs and Assembly Hubs; however, this page does not describe the settings unique to
 Assembly Hubs. Track Hubs can display novel genomes, through a type of hub called an
 <a href="../hgTrackHubHelp.html#Assembly" target="_blank">Assembly Hub</a>.
 The <a href="../hgTrackHubHelp.html#example_genomes.txt"
 target="_blank"><code>genomes.txt</code></a> file for an Assembly Hub involves
 many additional settings not described on this page, such as
 <a href="../hgTrackHubHelp.html#twoBitPath" target="_blank"><code>twoBitPath</code></a> and
 <a href="../hgTrackHubHelp.html#defaultPos" target="_blank"><code>defaultPos</code></a> to
 identify the location of the sequence for the novel assembly and what default position to
 display. The <code>genomes.txt</code> file in Assembly Hubs also requires display information
 such as <a href="../hgTrackHubHelp.html#organism" target="_blank"><code>organism</code></a>,