diff --git a/cosmetics-web/app/views/help/csv.html.erb b/cosmetics-web/app/views/help/csv.html.erb
index 1564aa90be..a9e74f61b6 100644
--- a/cosmetics-web/app/views/help/csv.html.erb
+++ b/cosmetics-web/app/views/help/csv.html.erb
@@ -35,6 +35,7 @@
     <ul class="govuk-list govuk-list--bullet govuk-!-font-size-16 opss-secondary-text">
       <li>If it is shown as an ingredient on the product label, it must be added to the notification as an ingredient</li>
       <li>Use the International Nomenclature of Cosmetic Ingredients (<abbr>INCI</abbr>) name, where available</li>
+      <li>Provide the  Chemical Abstracts Service (<abbr>CAS</abbr>) number, where available</li>
       <li>Confirm if the ingredient is listed in the National Poisons Information Service (<abbr>NPIS</abbr>) tables and if the <abbr>NPIS</abbr> need to be notified about this ingredient</li>
     </ul>
     <div class="govuk-grid-row">
diff --git a/cosmetics-web/app/views/responsible_persons/notifications/components/build/add_ingredients/_instructions.html.erb b/cosmetics-web/app/views/responsible_persons/notifications/components/build/add_ingredients/_instructions.html.erb
index 8b622a08a2..84a2e96da7 100644
--- a/cosmetics-web/app/views/responsible_persons/notifications/components/build/add_ingredients/_instructions.html.erb
+++ b/cosmetics-web/app/views/responsible_persons/notifications/components/build/add_ingredients/_instructions.html.erb
@@ -6,6 +6,7 @@
         <li>If it is shown as an ingredient on the product label it must to be added to the notification as an ingredient</li>
       <% end %>
       <li>Use the International Nomenclature of Cosmetic Ingredients (<abbr>INCI</abbr>) name, where available</li>
+      <li>Provide the  Chemical Abstracts Service (CAS) number, where available</li>
       <li>Refer to the National Poisons Information Service (NPIS) tables to confirm if the NPIS needs to be notified of the ingredient</li>
     </ul>