diff --git a/man7/udp.7 b/man7/udp.7
index 313c78d68..e2e723aff 100644
--- a/man7/udp.7
+++ b/man7/udp.7
@@ -16,6 +16,8 @@ udp \- User Datagram Protocol for IPv4
 .B #include <sys/socket.h>
 .br
 .B #include <netinet/in.h>
+.br
+.B #include <netinet/udp.h>
 .sp
 .B udp_socket = socket(AF_INET, SOCK_DGRAM, 0);
 .SH DESCRIPTION