diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 65c6b0f..f9c5a78 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -1163,11 +1163,13 @@
  *	STA can receive. Rate expressed in units of 1 Mbps.
  *	If this field is 0 this value should not be used to
  *	consider the highest RX data rate supported.
+ *	The top 3 bits of this field are reserved.
  * @tx_mcs_map: TX MCS map 2 bits for each stream, total 8 streams
  * @tx_highest: Indicates highest long GI VHT PPDU data rate
  *	STA can transmit. Rate expressed in units of 1 Mbps.
  *	If this field is 0 this value should not be used to
  *	consider the highest TX data rate supported.
+ *	The top 3 bits of this field are reserved.
  */
 struct ieee80211_vht_mcs_info {
 	__le16 rx_mcs_map;
@@ -1177,6 +1179,27 @@
 } __packed;
 
 /**
+ * enum ieee80211_vht_mcs_support - VHT MCS support definitions
+ * @IEEE80211_VHT_MCS_SUPPORT_0_7: MCSes 0-7 are supported for the
+ *	number of streams
+ * @IEEE80211_VHT_MCS_SUPPORT_0_8: MCSes 0-8 are supported
+ * @IEEE80211_VHT_MCS_SUPPORT_0_9: MCSes 0-9 are supported
+ * @IEEE80211_VHT_MCS_NOT_SUPPORTED: This number of streams isn't supported
+ *
+ * These definitions are used in each 2-bit subfield of the @rx_mcs_map
+ * and @tx_mcs_map fields of &struct ieee80211_vht_mcs_info, which are
+ * both split into 8 subfields by number of streams. These values indicate
+ * which MCSes are supported for the number of streams the value appears
+ * for.
+ */
+enum ieee80211_vht_mcs_support {
+	IEEE80211_VHT_MCS_SUPPORT_0_7	= 0,
+	IEEE80211_VHT_MCS_SUPPORT_0_8	= 1,
+	IEEE80211_VHT_MCS_SUPPORT_0_9	= 2,
+	IEEE80211_VHT_MCS_NOT_SUPPORTED	= 3,
+};
+
+/**
  * struct ieee80211_vht_cap - VHT capabilities
  *
  * This structure is the "VHT capabilities element" as