diff --git a/draft-ietf-quic-ack-frequency.md b/draft-ietf-quic-ack-frequency.md
index 544f3e5f..68d6ec27 100644
--- a/draft-ietf-quic-ack-frequency.md
+++ b/draft-ietf-quic-ack-frequency.md
@@ -114,7 +114,7 @@ behavior. This document specifies an extension to QUIC that permits an endpoint
 request that its peer changes its behavior when sending or delaying acknowledgments.
 
 This document defines a new transport parameter to announce the support of this
-extension and specifies two new frame types to request changes the peer's
+extension and specifies two new frame types to request changes to the peer's
 acknowledgement behavior.
 
 ## Terms and Definitions