--- a/gcms2isocor.xml	Tue Oct 05 12:44:23 2021 +0000
+++ b/gcms2isocor.xml	Tue Oct 19 15:21:18 2021 +0000
@@ -24,7 +24,14 @@
         </test>
     </tests>
     <help><![CDATA[
-        Conversion from GCMS PostRun Analysis to Isocore.
-	Processes GCMS files with the following categories: Header, MS Quantitative Results.
+        Convert the GC-MS raw data input files into a unique table suitable as input file for IsoCor.
+	
+	Processes GCMS files should be exported with the following categories: [Header], [MS Quantitative Results].
+	GC-MS raw dataset should contains a column "Name" filled with each carbon isotopologue of each fragment considered and a column "Area" filled with the area of the integrated peak. 
+	The name of each fragment must be written exactly as specified in the "Metabolite.dat" file (see https://isocor.readthedocs.io/en/latest/tutorials.html#input-data) to ensure accurate correction with
+	IsoCor. 
+
+	Example: the name “ProlineC2C5_TMS_m0” is for the GC-MS fragment m/z 142 (integrated peak) containing the C2-C3-C4-C5 carbon skeleton of proline and 1 TMS derivative. m0 refers to the carbon isotopologue
+	monitored (m0 for m/z = 142, m1 for m/z = 143, m2 for m/z = 144, m3 for m/z = 145, m4 for m/z = 146).
     ]]></help>
 </tool>