--- a/bed_size_stat.xml	Sat Mar 31 14:02:27 2012 -0400
+++ b/bed_size_stat.xml	Sat Mar 31 18:50:12 2012 -0400
@@ -1,8 +1,9 @@
 <tool id="interval_size" name="interval_size">
   <description>plot interval size distribution</description>
-  <command interpreter="python">bed_size_stat.py $input $output</command>
+  <command interpreter="python">bed_size_stat.py $input $output $log </command>
   <inputs>
     <param name="input" format="txt" type="data" label="Plot the size distribution of the following file"/>
+    <param name="log" label="log plot" type="boolean" truevalue="log" falsevalue="none" checked="true"/>
   </inputs>
   <outputs>
     <data format="pdf" name="output" />