diff --git a/docs/design/api.rst b/docs/design/api.rst
index 31f641a..e841c17 100644
--- a/docs/design/api.rst
+++ b/docs/design/api.rst
@@ -111,7 +111,7 @@ This makes a separate “You’re subscribed to [product]” email unnecessary.
 Subscription charge succeeded
 +++++++++++++++++++++++++++++
 
-The reception of email receipt already indicates that the charge was succeeded. No need to send a separate email.
+When a subscription charge succeeds, a receipt is sent.
 
 Subscription charge failed
 ++++++++++++++++++++++++++