b44df11903f0c8537dc9d716df324906bc89f92b
lrnassar
  Thu Jun 15 13:21:32 2023 -0700
Adding documentation supporting snakes rearrangement display, refs #31241

diff --git src/hg/htdocs/FAQ/FAQformat.html src/hg/htdocs/FAQ/FAQformat.html
index 0ea7326..e97207e 100755
--- src/hg/htdocs/FAQ/FAQformat.html
+++ src/hg/htdocs/FAQ/FAQformat.html
@@ -270,31 +270,33 @@
 chr11	5246919	5246920	Hb_North_York	2619	Hemoglobin variant
 chr11	5255660	5255661	HBD c.1 G>A	2659	delta0 thalassemia
 chr11	5247945	5247946	Hb Sheffield	2672	Hemoglobin variant
 chr11	5255415	5255416	Hb A2-Lyon	2676	Hemoglobin variant
 chr11&#09;5248234&#09;5248235&#09;Hb Aix-les-Bains&#09;2677&#09;Hemoglobin variant </code></pre>
 <p>
 To see an example of turning a bedDetail custom track into the <code>bigBed</code>
 format, see this <a href="https://genome-blog.soe.ucsc.edu/blog/2021/08/03/how-make-a-bigbed-file-part-1/"
 target="_blank">How to make a bigBed file</a> blog post.</p>
 
 <a name="format2"></a>
 <h2>PSL format</h2>
 <p>
 PSL lines represent alignments, and are typically taken from files generated by BLAT or psLayout. 
 See the <a href="../goldenPath/help/hgTracksHelp.html#BLATAlign" target="_blank">BLAT
-documentation</a> for more details. All of the following fields are required on each data line 
+documentation</a> for more details. PSL data tracks can also be visualized in 
+<a href="../goldenPath/help/chain.html#rearrangement" target="_blank">rearrangement 
+display mode</a>. All of the following fields are required on each data line 
 within a PSL file:</p>
 <ol>
   <li>
   <strong>matches</strong> - Number of bases that match that aren't repeats</li>
   <li>
   <strong>misMatches</strong> - Number of bases that don't match</li>
   <li>
   <strong>repMatches</strong> - Number of bases that match but are part of repeats</li>
   <li>
   <strong>nCount</strong> - Number of &quot;N&quot; bases</li>
   <li>
   <strong>qNumInsert</strong> - Number of inserts in query</li>
   <li>
   <strong>qBaseInsert</strong> - Number of bases inserted in query</li>
   <li>