diff --git a/CHANGES b/CHANGES
index 6ba062216a..c3686c3761 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,8 @@
 3839.	[test]		Use only posix-compatible shell in system tests.
 			[RT #35625]
 
+3838.	[protocol]	EDNS EXPIRE as been assigned a code point of 9.
+
 3836.	[bug]		Address C++ keyword usage in header file.
 
 3834.	[bug]		The re-signing heaps were not being updated soon enough
diff --git a/lib/dns/include/dns/message.h b/lib/dns/include/dns/message.h
index 0d9eb237eb..c678238d22 100644
--- a/lib/dns/include/dns/message.h
+++ b/lib/dns/include/dns/message.h
@@ -106,6 +106,7 @@
 /*%< EDNS0 extended OPT codes */
 #define DNS_OPT_NSID		0x0003		/*%< NSID opt code */
 #define DNS_OPT_CLIENT_SUBNET	0x0008		/*%< client subnet opt code */
+#define DNS_OPT_EXPIRE		0x0009		/*%< EXPIRE opt code */
 
 /*%< The number of EDNS options we know about. */
 #define DNS_EDNSOPTIONS	3