diff --git a/draft-ietf-quic-transport.md b/draft-ietf-quic-transport.md
index dc6eac0d16..82f5bbbdc2 100644
--- a/draft-ietf-quic-transport.md
+++ b/draft-ietf-quic-transport.md
@@ -7411,7 +7411,7 @@ The EncodePacketNumber function takes two arguments:
 
 * full_pn is the full packet number of the packet being sent.
 * largest_acked is the largest packet number which has been acknowledged by the
-  peer in the current packet number space, if any
+  peer in the current packet number space, if any.
 
 ~~~
 EncodePacketNumber(full_pn, largest_acked):