--- a/SMART/galaxy/WrappGetLetterDistribution.xml	Fri Apr 19 10:13:11 2013 -0400
+++ b/SMART/galaxy/WrappGetLetterDistribution.xml	Mon Apr 22 11:08:07 2013 -0400
@@ -1,5 +1,5 @@
 <tool id="getLetterDistribution1" name="Get Letter Distribution">
-    <description>Calculate distribution for each nucleotide per position for all short reads (S-MART)</description>
+    <description>Calculate distribution for each nucleotide per position for all short reads</description>
     <command interpreter="python">
 	    WrappGetLetterDistribution.py -i $inputFileName
 	#if $formatType.FormatInputFileName == 'fasta':
@@ -28,6 +28,18 @@
                	<data name="ouputFileNameCSV" format="tabular" label="[getLetterDistribution] CSV File"/>
                	<data name="ouputFileNamePNG1" format="png" label="[getLetterDistribution] PNG File 1"/>
                	<data name="ouputFileNamePNG2" format="png" label="[getLetterDistribution] PNG File 2"/>
-    </outputs> 
+    </outputs>
+    <tests>
+    	<test>
+            <param name="FormatInputFileName" value="fastq" />
+            <param name="inputFileName" value="short_fastq.fastq" />
+            <output name="outputFileNameCSV" file="exp_getletterdistribution_short_fastq.csv" />     
+        </test>
+    </tests>
+
+	<help>
+The script gets the nucleotide distribution of the input sequence list. It outputs two files. The first file shows the nucleotide distribution of the data. More precisely, a point (*x*, *y*) on the curve **A** shows that *y* sequences have *x*% of **A**.
+  
+The second plot shows the average nucleotide distribution for each position of the read. You can use it to detect a bias in the first nucleotides, for instance. A point *x*, *y* on the curve **A** shows that at the position *x*, there are *y*% of **A**. A point (*x*, *y*) on the curve **#** tells you that *y*% of the sequences contain not less than *x* nucleotides. By definition, this latter line is a decreasing function. It usually explains why the tail of the other curves are sometimes erratic: there are few sequences.
+	</help>
 </tool>
-