diff --git a/conservancy/supporters/templates/supporters/mail/sustainer_thanks.txt b/conservancy/supporters/templates/supporters/mail/sustainer_thanks.txt
index 8cb73ffc..fcbd8e3b 100644
--- a/conservancy/supporters/templates/supporters/mail/sustainer_thanks.txt
+++ b/conservancy/supporters/templates/supporters/mail/sustainer_thanks.txt
@@ -14,5 +14,7 @@ Postal address:
 {% if order.recurring == 'month' and order.tshirt_size %}
 Please note that you may not receive the T-shirt until you've paid at least $60.{% endif %}
 
+An official donation receipt suitable for tax purposes should arrive via email within 2 weeks.
+
 Kind regards,
 Software Freedom Conservancy{% endautoescape %}