diff --git a/NEWS b/NEWS
index b2ac187218..6b094e945c 100644
--- a/NEWS
+++ b/NEWS
@@ -91,7 +91,9 @@ with all sufficient information, see the ChangeLog file.
   * incompatible changes:
     * Socket#{recvfrom,recvfrom_nonblock,accept,accept_nonblock,sysaccept}
       returns a sender address as Addrinfo object instead of a binary sockaddr string.
+      Addrinfo#to_s returns the old binary sockaddr string.
     * BasicSocket#getsockopt returns Socket::Option object instead of a binary string.
+      Socket::Option#to_s returns the old binary string.
 
   * new class:
     * Addrinfo