diff --git a/tools/data_source/upload.xml b/tools/data_source/upload.xml
index 79df1f8d83f..07c2d30c903 100644
--- a/tools/data_source/upload.xml
+++ b/tools/data_source/upload.xml
@@ -25,7 +25,7 @@
     </param>
     <param name="async_datasets" type="hidden" value="None"/>
     <upload_dataset name="files" title="Specify Files for Dataset" file_type_name="file_type" metadata_ref="files_metadata">
-      <param name="file_data" type="file" size="30" label="File" ajax-upload="true">
+      <param name="file_data" type="file" size="30" label="File" ajax-upload="true" help="TIP: For NGS and other large files (>~2GB), uploading via HTTP/FTP URL (below) is the most reliable method.">
         <validator type="expression" message="You will need to reselect the file you specified (%s)." substitute_value_in_message="True">not ( ( isinstance( value, unicode ) or isinstance( value, str ) ) and value != "" )</validator> <!-- use validator to post message to user about needing to reselect the file, since most browsers won't accept the value attribute for file inputs -->
       </param>
       <param name="url_paste" type="text" area="true" size="5x35" label="URL/Text" help="Here you may specify a list of URLs (one per line) or paste the contents of a file."/>