diff --git a/tools/extract/liftOver_wrapper.xml b/tools/extract/liftOver_wrapper.xml
index 3e5c91d7746..d6c542f8bf2 100644
--- a/tools/extract/liftOver_wrapper.xml
+++ b/tools/extract/liftOver_wrapper.xml
@@ -2,7 +2,7 @@
   <description> between assemblies and genomes</description>
   <command interpreter="python">liftOver_wrapper.py $input "$out_file1" "$out_file2" $dbkey $to_dbkey</command>
   <inputs>
-    <param format="bed" name="input" type="data" label="Convert coordinates of">
+    <param format="interval" name="input" type="data" label="Convert coordinates of">
       <validator type="unspecified_build" />
     </param>
     <param name="to_dbkey" type="select" label="To">
@@ -15,8 +15,8 @@
     </param> 
   </inputs>
   <outputs>
-    <data format="bed" name="out_file1" />
-    <data format="bed" name="out_file2" />
+    <data format="input" name="out_file1" />
+    <data format="input" name="out_file2" />
   </outputs>
   <requirements>
     <requirement type="binary">liftOver</requirement>
@@ -41,6 +41,10 @@ Make sure that the genome build of the input dataset is specified (click the pen
 
 The **To** list will be empty if we don't carry any liftover mappings corresponding to the genome build of the input dataset. 
 
+.. class:: warningmark
+
+This tool will only work on interval datasets with chromosome in column 1, start co-ordinate in column 2 and end co-ordinate in column 3. If this is not the case, it will return empty output datasets.
+
 -----
 
 .. class:: infomark