diff --git a/express/resources/allowed-email-domains.txt b/express/resources/allowed-email-domains.txt
index e9807b370..1da2f9a61 100644
--- a/express/resources/allowed-email-domains.txt
+++ b/express/resources/allowed-email-domains.txt
@@ -1,4 +1,5 @@
 artscouncil.org.uk
+caa.co.uk
 digital.mod.uk
 gov.uk
 gov.wales
diff --git a/express/src/views/register/enter-email-address.njk b/express/src/views/register/enter-email-address.njk
index 374a0aa7b..a84d9923a 100644
--- a/express/src/views/register/enter-email-address.njk
+++ b/express/src/views/register/enter-email-address.njk
@@ -7,6 +7,7 @@
   <p class="govuk-body">You can only use this service if you have an email address that ends in:</p>
   <ul class="govuk-list govuk-list--bullet">
     <li>artscouncil.org.uk</li>
+    <li>caa.co.uk</li>
     <li>digital.mod.uk</li>
     <li>gov.uk</li>
     <li>gov.wales</li>