--- a/README.rst	Wed Mar 07 09:37:57 2018 -0500
+++ b/README.rst	Wed Mar 14 12:40:35 2018 -0400
@@ -31,7 +31,7 @@
 compared to a background (whole organism or user-defined list). 
 
 **Input required**
-    
+
 This component works with Gene ids (e.g : 4151, 7412) or Uniprot accession number (e.g. P31946). 
 You can copy/paste these identifiers or supply a tabular file (.csv, .tsv, .txt, .tab) where there are contained.
 
@@ -42,4 +42,11 @@
 
 **User manual / Documentation** of the clusterProfiler R package (functions and parameters):
 https://bioconductor.org/packages/3.7/bioc/vignettes/clusterProfiler/inst/doc/clusterProfiler.html
-(Very well explained)
\ No newline at end of file
+(Very well explained)
+
+**Reference**
+ 
+clusterProfiler R package reference : 
+G Yu, LG Wang, Y Han, QY He. clusterProfiler: an R package for comparing biological themes among gene clusters. 
+OMICS: A Journal of Integrative Biology 2012, 16(5):284-287. 
+doi:[10.1089/omi.2011.0118](http://dx.doi.org/10.1089/omi.2011.0118)

--- a/cluster_profiler.xml	Wed Mar 07 09:37:57 2018 -0500
+++ b/cluster_profiler.xml	Wed Mar 14 12:40:35 2018 -0400
@@ -65,7 +65,7 @@
             <when value="file" >
                 <param name="file" type="data" format="txt,tabular" label="Choose a file that contains your list of IDs" help="" />
                 <param name="header" type="boolean" checked="true" truevalue="true" falsevalue="false" label="Does your input file contain header?" />
-                <param name="ncol" type="text" label="The column number of IDs to map" help='For example, fill in "c1" if it is the first column, "c2" if it is the second column and so on' />                
+                <param name="ncol" type="text" value="c1" label="The column number of IDs to map" help='For example, fill in "c1" if it is the first column, "c2" if it is the second column and so on' />                
             </when>
         </conditional>
         <conditional name="idti" >