--- a/mergeBed.xml	Tue May 19 07:05:36 2015 -0400
+++ b/mergeBed.xml	Wed May 27 12:54:35 2015 -0400
@@ -28,7 +28,9 @@
             label="Maximum distance between features allowed for features to be merged"
             help="That is, overlapping and/or book-ended features are merged. (-d)"/>
         <expand macro="print_header" />
-        <expand macro="c_and_o_argument" />
+        <expand macro="c_and_o_argument">
+            <param name="col" type="data_column" data_ref="input" label="Specify the column(s) that should be summarized" help="(-c)" />
+        </expand>
     </inputs>
     <outputs>
         <data format="bed" name="output" metadata_source="input" label="Merged ${input.name}"/>