diff --git a/CHANGES b/CHANGES
index cdb9a2e..5238089 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6,6 +6,9 @@ Changes in 5.1:
 
 	Build fixes.
 
+	Fix handling of block number wraparound after a successful
+	options negotiation.
+
 
 Changes in 5.0:
 	Try to on platforms with getaddrinfo() without AI_ADDRCONFIG or