diff --git a/tools/maaslin2/maaslin2.xml b/tools/maaslin2/maaslin2.xml
index 1d319ae0155..ea8e471f49e 100644
--- a/tools/maaslin2/maaslin2.xml
+++ b/tools/maaslin2/maaslin2.xml
@@ -55,7 +55,7 @@ cd outputFolder && mkdir -p figures/ && cp *.pdf figures
     <inputs>
         <param name="input_data" type="data" format="tabular" label="Data (or features) file"/>
         <param name="input_metadata" type="data" format="tabular" label="Metadata file"/>
-        <param argument="--fixed_effects" type="select" multiple="true" optional="true" label="Interactions: Fixed effects" help="The fixed effects for the model, comma-delimited for multiple effects">
+        <param argument="--fixed_effects" type="text" multiple="true" optional="true" label="Interactions: Fixed effects" help="The fixed effects for the model, comma-delimited for multiple effects">
             <option value="diagnosis" selected="true">diagnosis</option>
             <option value="dysbiosisnonIBD" selected="true">dysbiosisnonIBD</option>
             <option value="dysbiosisUC" selected="true">dysbiosisUC</option>
@@ -87,7 +87,14 @@ cd outputFolder && mkdir -p figures/ && cp *.pdf figures
                 <option value="NEGBIN">NEGBIN</option>
                 <option value="ZINB">ZINB</option>
             </param>
-            <param argument="--correction" type="text" value="BH" optional="true" label="Correction" help="The correction method for computing  the q-value"/>
+            <param argument="--correction" type="select" value="BH" multiple="true" optional="true" label="Correction" help="The correction method for computing  the q-value">
+            <option value="holm">holm</option>
+            <option value="hochberg">hochberg</option>
+            <option value="hommel">hommel</option>
+            <option value="bonferroni">bonferroni</option>
+            <option value="BH">BH</option>
+            <option value="BY">BY</option>
+            </param>
             <param argument="--standardize" type="boolean" truevalue="--standardize TRUE" falsevalue="--standardize FALSE" checked="true" label="Apply z-score so continuous metadata are on  the same scale"/>
         </section>          
         <section name="output" title="Set Plotting Output" expanded="true">