diff --git a/libc/kernel/uapi/linux/smc.h b/libc/kernel/uapi/linux/smc.h
index 01494da..be6b71f 100644
--- a/libc/kernel/uapi/linux/smc.h
+++ b/libc/kernel/uapi/linux/smc.h
@@ -57,6 +57,9 @@
   SMC_NETLINK_DUMP_SEID,
   SMC_NETLINK_ENABLE_SEID,
   SMC_NETLINK_DISABLE_SEID,
+  SMC_NETLINK_DUMP_HS_LIMITATION,
+  SMC_NETLINK_ENABLE_HS_LIMITATION,
+  SMC_NETLINK_DISABLE_HS_LIMITATION,
 };
 enum {
   SMC_GEN_UNSPEC,
@@ -249,4 +252,11 @@
   __SMC_NLA_SEID_TABLE_MAX,
   SMC_NLA_SEID_TABLE_MAX = __SMC_NLA_SEID_TABLE_MAX - 1
 };
+enum {
+  SMC_NLA_HS_LIMITATION_UNSPEC,
+  SMC_NLA_HS_LIMITATION_ENABLED,
+  __SMC_NLA_HS_LIMITATION_MAX,
+  SMC_NLA_HS_LIMITATION_MAX = __SMC_NLA_HS_LIMITATION_MAX - 1
+};
+#define SMC_LIMIT_HS 1
 #endif