diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index af8b41e57b3..77887295dab 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -550,6 +550,7 @@ options 	NETGRAPH_RFC1490
 options 	NETGRAPH_SOCKET
 options 	NETGRAPH_SPLIT
 options 	NETGRAPH_SPPP
+options 	NETGRAPH_TCPMSS
 options 	NETGRAPH_TEE
 options 	NETGRAPH_TTY
 options 	NETGRAPH_UI
diff --git a/sys/conf/files b/sys/conf/files
index c8f24f34199..2a3e4fbe181 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1542,6 +1542,7 @@ netgraph/ng_rfc1490.c		optional netgraph_rfc1490
 netgraph/ng_socket.c		optional netgraph_socket
 netgraph/ng_split.c		optional netgraph_split
 netgraph/ng_sppp.c		optional netgraph_sppp
+netgraph/ng_tcpmss.c		optional netgraph_tcpmss
 netgraph/ng_tee.c		optional netgraph_tee
 netgraph/ng_tty.c		optional netgraph_tty
 netgraph/ng_vjc.c		optional netgraph_vjc
diff --git a/sys/conf/options b/sys/conf/options
index 7fb5e06cb00..4fec7c6fca5 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -423,6 +423,7 @@ NETGRAPH_RFC1490	opt_netgraph.h
 NETGRAPH_SOCKET		opt_netgraph.h
 NETGRAPH_SPLIT		opt_netgraph.h
 NETGRAPH_SPPP		opt_netgraph.h
+NETGRAPH_TCPMSS		opt_netgraph.h
 NETGRAPH_TEE		opt_netgraph.h
 NETGRAPH_TTY		opt_netgraph.h
 NETGRAPH_UI		opt_netgraph.h
diff --git a/sys/modules/netgraph/Makefile b/sys/modules/netgraph/Makefile
index 576c089ddc4..b2b6af4ec4a 100644
--- a/sys/modules/netgraph/Makefile
+++ b/sys/modules/netgraph/Makefile
@@ -40,6 +40,7 @@ SUBDIR=	async \
 	sppp \
 	${_sync_ar} \
 	${_sync_sr} \
+	tcpmss \
 	tee \
 	tty \
 	UI \
diff --git a/sys/modules/netgraph/tcpmss/Makefile b/sys/modules/netgraph/tcpmss/Makefile
new file mode 100644
index 00000000000..0379c88cec7
--- /dev/null
+++ b/sys/modules/netgraph/tcpmss/Makefile
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+KMOD=	ng_tcpmss
+SRCS= 	ng_tcpmss.c
+
+.include <bsd.kmod.mk>