diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 3583f7fc075c00f7634128bd0cc7963e3a6c6cf0..5c631a29899417aaf7f576018c2fb84acab6442f 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -410,6 +410,8 @@ struct ethtool_pause_stats {
  * @get_ethtool_phy_stats: Return extended statistics about the PHY device.
  *	This is only useful if the device maintains PHY statistics and
  *	cannot use the standard PHY library helpers.
+ * @get_phy_tunable: Read the value of a PHY tunable.
+ * @set_phy_tunable: Set the value of a PHY tunable.
  *
  * All operations are optional (i.e. the function pointer may be set
  * to %NULL) and callers must take this into account.  Callers must