--- a/validate_affy_metadata.xml	Tue Dec 04 13:51:21 2018 -0500
+++ b/validate_affy_metadata.xml	Tue Jan 22 11:05:08 2019 -0500
@@ -6,7 +6,7 @@
 --output '$output']]></command>
     <inputs>
         <param name="input" type="data" format="tabular" label="Affymetrix 96 well plate metadata file">
-            <validator type="expression" message="96 well plate data must have 29 columns and no more than 96 lines of data"><![CDATA[value is not None and value.metadata.columns==29 and value.metadata.data_lines<=96]]></validator>
+            <validator type="expression" message="96 well plate data must have 28 columns and no more than 96 lines of data"><![CDATA[value is not None and value.metadata.columns==28 and value.metadata.data_lines<=96]]></validator>
         </param>
     </inputs>
     <outputs>
@@ -21,7 +21,7 @@
     <help>
 **What it does**
 
-Validates an Affymetrix metadata file for 96 well plate data.  These files consist of 29 columns and no more than 96 data lines.
+Validates an Affymetrix metadata file for 96 well plate data.  These files consist of 28 columns and no more than 96 data lines.
 The tool will output the input file if it is valid.
 
 -----