diff --git a/libc/kernel/uapi/linux/ethtool.h b/libc/kernel/uapi/linux/ethtool.h
index 67a7efd..6b2b8d5 100644
--- a/libc/kernel/uapi/linux/ethtool.h
+++ b/libc/kernel/uapi/linux/ethtool.h
@@ -604,6 +604,8 @@
   ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT = 64,
   ETHTOOL_LINK_MODE_200000baseDR4_Full_BIT = 65,
   ETHTOOL_LINK_MODE_200000baseCR4_Full_BIT = 66,
+  ETHTOOL_LINK_MODE_100baseT1_Full_BIT = 67,
+  ETHTOOL_LINK_MODE_1000baseT1_Full_BIT = 68,
   __ETHTOOL_LINK_MODE_MASK_NBITS
 };
 #define __ETHTOOL_LINK_MODE_LEGACY_MASK(base_name) (1UL << (ETHTOOL_LINK_MODE_ ##base_name ##_BIT))