diff --git a/include/ntapi/nt_socket.h b/include/ntapi/nt_socket.h
index 2c34322..4ec8582 100644
--- a/include/ntapi/nt_socket.h
+++ b/include/ntapi/nt_socket.h
@@ -286,6 +286,35 @@ typedef enum _nt_afd_tcp_state {
 
 
 
+/* afd tcp socket options */
+#define NT_TCP_OFFLOAD_NO_PREFERENCE            (0)
+#define NT_TCP_OFFLOAD_NOT_PREFERRED            (1)
+#define NT_TCP_OFFLOAD_PREFERRED                (2)
+
+#define NT_TCP_NODELAY                          (1)
+#define NT_TCP_EXPEDITED_1122                   (2)
+#define NT_TCP_KEEPALIVE                        (3)
+#define NT_TCP_MAXSEG                           (4)
+#define NT_TCP_MAXRT                            (5)
+#define NT_TCP_STDURG                           (6)
+#define NT_TCP_NOURG                            (7)
+#define NT_TCP_ATMARK                           (8)
+#define NT_TCP_NOSYNRETRIES                     (9)
+#define NT_TCP_TIMESTAMPS                       (10)
+#define NT_TCP_OFFLOAD_PREFERENCE               (11)
+#define NT_TCP_CONGESTION_ALGORITHM             (12)
+#define NT_TCP_DELAY_FIN_ACK                    (13)
+#define NT_TCP_MAXRTMS                          (14)
+#define NT_TCP_FASTOPEN                         (15)
+#define NT_TCP_KEEPCNT                          (16)
+#define NT_TCP_KEEPINTVL                        (17)
+#define NT_TCP_FAIL_CONNECT_ON_ICMP_ERROR       (18)
+#define NT_TCP_ICMP_ERROR_INFO                  (19)
+
+#define NT_TCP_KEEPIDLE                         NT_TCP_KEEPALIVE
+
+
+
 /* tdi receive modes */
 #define NT_TDI_RECEIVE_BROADCAST		(0x0004u)
 #define NT_TDI_RECEIVE_MULTICAST		(0x0008u)