diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index 51dd76f7b7e9..041cd6c3d201 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -356,6 +356,23 @@ support, the exact level of offloading varies between drivers.
 If the driver supports user-configurable checksum offloading,
 disable receive (or transmit) checksum offloading on the interface.
 These settings may not always be independent of each other.
+.It Cm tso
+If the driver supports
+.Xr tcp 4
+segmentation offloading, enable TSO on the interface.
+Some drivers may not be able to support TSO for
+.Xr ip 4
+and
+.Xr ip6 4
+packets, so they may enable only one of them.
+.It Fl tso
+If the driver supports
+.Xr tcp 4
+segmentation offloading, disable TSO on the interface.
+It will always disable TSO for
+.Xr ip 4
+and
+.Xr ip6 4 .
 .It Cm vlanmtu , vlanhwtag
 If the driver offers user-configurable VLAN support, enable
 reception of extended frames or tag processing in hardware,
diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c
index 3f0172f5459e..0f3c184b8d45 100644
--- a/sbin/ifconfig/ifconfig.c
+++ b/sbin/ifconfig/ifconfig.c
@@ -805,7 +805,7 @@ rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 
 #define	IFCAPBITS \
 "\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7POLLING" \
-"\10VLAN_HWCSUM"
+"\8TSO4\9TSO6\10VLAN_HWCSUM"
 
 /*
  * Print the status of the interface.  If an address family was
@@ -1035,6 +1035,8 @@ static struct cmd basic_cmds[] = {
 	DEF_CMD("-netcons",	-IFCAP_NETCONS,	setifcap),
 	DEF_CMD("polling",	IFCAP_POLLING,	setifcap),
 	DEF_CMD("-polling",	-IFCAP_POLLING,	setifcap),
+	DEF_CMD("tso",		IFCAP_TSO,	setifcap),
+	DEF_CMD("-tso",		-IFCAP_TSO,	setifcap),
 	DEF_CMD("normal",	-IFF_LINK0,	setifflags),
 	DEF_CMD("compress",	IFF_LINK0,	setifflags),
 	DEF_CMD("noicmp",	IFF_LINK1,	setifflags),