diff --git a/include/ntapi/nt_socket.h b/include/ntapi/nt_socket.h
index 7e433b9..c6f47b9 100644
--- a/include/ntapi/nt_socket.h
+++ b/include/ntapi/nt_socket.h
@@ -219,6 +219,11 @@
 #define NT_AFD_IOCTL_GET_CONTEXT		(0x12043u)
 #define NT_AFD_IOCTL_SET_INFO			(0x1203bu)
 #define NT_AFD_IOCTL_GET_INFO			(0x1207bu)
+#define NT_AFD_IOCTL_SOCKOPT			(0x120bfu)
+
+/* afd sockopt mode bits */
+#define NT_AFD_SOCKOPT_SET			(0x01u)
+#define NT_AFD_SOCKOPT_GET			(0x02u)
 
 /* afd poll socket info bits */
 #define NT_AFD_POLL_RECEIVE			(0x01u)
@@ -375,6 +380,16 @@ typedef struct _nt_afd_recv_info {
 } nt_afd_recv_info;
 
 
+typedef struct _nt_afd_sockopt_info {
+	uint32_t		mode;
+	uint32_t		level;
+	uint32_t		optname;
+	uint32_t		ding;
+	const void *		optval;
+	size_t			optlen;
+} nt_afd_sockopt_info;
+
+
 typedef struct _nt_afd_poll_socket_info {
 	void *			hsocket;
 	uint32_t		events;