--- a/jbrowse2.xml	Sun Jul 28 02:42:43 2024 +0000
+++ b/jbrowse2.xml	Tue Aug 20 06:43:01 2024 +0000
@@ -335,7 +335,7 @@
                         tabix bgzip with predictable index file URI</option>
                 </param>
                 <when value="indexed">
-                    <param name="genome" type="select" optional="true" label="Select a built in reference genome or custom genome" help="If not listed, add a custom genome, use a history genome or a remote URI tabix genome">
+                    <param name="genome" type="select" optional="false" label="Select a built in reference genome or custom genome" help="If not listed, add a custom genome, use a history genome or a remote URI tabix genome">
                         <options from_data_table="all_fasta">
                             <filter column="2" type="sort_by"/>
                             <validator message="No genomes are available for the selected input dataset" type="no_options"/>
@@ -343,7 +343,7 @@
                     </param>
                 </when>
                 <when value="history">
-                    <param name="genome" type="data" format="fasta" optional="true" label="Select the reference genome"/>
+                    <param name="genome" type="data" format="fasta" optional="false" label="Select the reference genome"/>
                 </when>
                 <when value="uri">
                     <param name="uri" type="text" label="URI pointing to tabix compressed fasta - must always be on-line" 
@@ -1153,6 +1153,8 @@
 Many Galaxy datatypes can be turned into a track for display - in all cases, the selected reference genome must have been 
 used to generate the data:
 
+::
+
     bam
     bed
     bigwig