diff --git a/app/views/bulk_upload_lettings_logs/forms/prepare_your_file.html.erb b/app/views/bulk_upload_lettings_logs/forms/prepare_your_file.html.erb
index d8cfedd08..199d87e5f 100644
--- a/app/views/bulk_upload_lettings_logs/forms/prepare_your_file.html.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/prepare_your_file.html.erb
@@ -15,6 +15,7 @@
         <li>Download the <%= govuk_link_to "bulk lettings template", @form.template_path %></li>
         <li>Export the data from your housing management system, matching the template</li>
         <li>If you cannot export it in this format, you may have to input it manually</li>
+        <li>You can not have a file with both general needs logs and supported housing logs. These must be in separate files</li>
       </ul>
 
       <h2 class="govuk-heading-m">Check your data</h2>