ef46bffc08cc131f944ee1b8f96465e60aeb5a29
kuhn
  Thu Sep 16 17:57:50 2021 -0700
clarified the meaning a bit per jonathan suggestion. refs #28158

diff --git src/hg/htdocs/goldenPath/help/customTrackText.html src/hg/htdocs/goldenPath/help/customTrackText.html
index abe9f31..3e8160b 100755
--- src/hg/htdocs/goldenPath/help/customTrackText.html
+++ src/hg/htdocs/goldenPath/help/customTrackText.html
@@ -401,31 +401,31 @@
 <a href="#ADD_CT">Loading a Custom Track into the Genome Browser</a>. If description text has been 
 uploaded for the track, it will be displayed in the track documentation edit box, where it may be 
 edited or completely replaced. Once you have completed your updates, click the Submit button to 
 upload the new data into the Genome Browser.</p>
 <p>
 If the data or description text for your custom track was originally loaded from a file on your hard
 disk or server, you should first edit the file, then reload it from the Update Custom Track page 
 using the &quot;Choose File&quot; button. Note that edits made on this page to description text uploaded 
 from a file will not be saved to the original file on your computer or server. Because of this, we 
 recommend that you use the documentation edit box only for changes made to text that was typed or 
 pasted in.</p> 
 
 <a name="lines"></a>
 <h3>Browser lines</h3>
 <p>
-Optional browser lines give you control of many aspects of the overall display of the
+Browser lines are optional, but they give you control of many aspects of the overall display of the
 Genome Browser window when your annotation file
 is uploaded. Each line defines one display attribute. Browser lines consist of the format:</p>
 <p>
 <pre><code>browser attribute_name attribute_value(s)</code></pre>
 
 <p>
 For example, if the browser line <code>browser position chr22:1-20000</code> is included in the 
 annotation file, the Genome Browser window will initially display the first 20000 bases of chr 
 22.</p>
 <p>
 The following browser line attribute name/value options are available. The value
 <em>track_primary_table_name</em> must be set to the name of the primary table on which the
 track is based. To identify this table, open up the
 <A HREF="../../cgi-bin/hgTables" TARGET=_blank>Table Browser</A>,
 select the correct genome assembly, then select the track name from the