--- a/iqtree.xml	Mon Jul 08 05:48:06 2024 +0000
+++ b/iqtree.xml	Tue Aug 20 08:50:41 2024 +0000
@@ -360,14 +360,14 @@
 $bootstrap_parameters.nonparametric_bootstrap.tbe
 
 #if str($miscellaneous_options.fconst) != ''
-    --fconst '$miscellaneous_options.fconst'
+    -fconst '$miscellaneous_options.fconst'
 #end if
 ]]>
     </command>
     <inputs>
         <section name="general_options" expanded="true" title="General options">
             <param argument="-s" type="data" format="txt,fasta,phylip,nex,clustal,msf" optional="true" label="Specify input alignment file in PHYLIP, FASTA, NEXUS, CLUSTAL or MSF format."/>
-            <param argument="-o" type="text" optional="true" label="Comma-separated list of taxons to output">
+            <param argument="-o" type="text" optional="true" label="Specify an outgroup taxon name to root the tree" help="If an outgroup taxon name is not specified, the first taxon in the alignment will be used to root the tree">
                 <expand macro="sanitize_query" />
             </param>