--- a/fastq_dump.xml	Tue Nov 13 12:02:29 2012 -0500
+++ b/fastq_dump.xml	Tue Nov 13 16:29:47 2012 -0500
@@ -1,5 +1,5 @@
-<tool id="fastq_dump" name="Extract fastq from SRA" version="1.0.0">
-  <description>Extract fastq format reads from SRA data archive.</description>
+<tool id="fastq_dump" name="Extract fastq" version="1.0.0">
+  <description> format reads from NCBI SRA.</description>
   <command>fastq-dump --accession ${input.name} --stdout $split $aligned $input > $output </command>
   <version_string>fastq-dump --version</version_string>
   <inputs>
@@ -19,6 +19,9 @@
   <outputs>
     <data format="fastqsanger" name="output"/>
   </outputs>
+  <requirements>
+    <requirement type="binary">fastq-dump</requirement>
+  </requirements>
   <help>
     This tool extracts fastqsanger reads from SRA archives using fastq-dump. The fastq-dump program is developed at NCBI, and is available at: http://www.ncbi.nlm.nih.gov/Traces/sra/sra.cgi?view=software.
   </help>