diff --git a/radiotap.c b/radiotap.c
index 0745ba8..a5c64a8 100644
--- a/radiotap.c
+++ b/radiotap.c
@@ -60,6 +60,7 @@ static const struct radiotap_align_size rtap_namespace_sizes[] = {
 	[IEEE80211_RADIOTAP_TX_FLAGS] = { .align = 2, .size = 2, },
 	[IEEE80211_RADIOTAP_RTS_RETRIES] = { .align = 1, .size = 1, },
 	[IEEE80211_RADIOTAP_DATA_RETRIES] = { .align = 1, .size = 1, },
+	[IEEE80211_RADIOTAP_RATE_MCS] = { .align = 1, .size = 2, },
 	/*
 	 * add more here as they are defined in
 	 * include/net/ieee80211_radiotap.h
diff --git a/radiotap.h b/radiotap.h
index 87455eb..3c3f591 100644
--- a/radiotap.h
+++ b/radiotap.h
@@ -178,6 +178,11 @@ struct ieee80211_radiotap_header {
  *
  *     Number of unicast retries a transmitted frame used.
  *
+ * IEEE80211_RADIOTAP_RATE_MCS       2 x u8          data, bitmap
+ *
+ *     First byte is the MCS index of the rate,
+ *     second one has flags about channel width and guard interval
+ *
  */
 enum ieee80211_radiotap_type {
 	IEEE80211_RADIOTAP_TSFT = 0,
@@ -198,6 +203,7 @@ enum ieee80211_radiotap_type {
 	IEEE80211_RADIOTAP_TX_FLAGS = 15,
 	IEEE80211_RADIOTAP_RTS_RETRIES = 16,
 	IEEE80211_RADIOTAP_DATA_RETRIES = 17,
+	IEEE80211_RADIOTAP_RATE_MCS = 19,
 
 	/* valid in every it_present bitmap, even vendor namespaces */
 	IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
@@ -243,4 +249,8 @@ enum ieee80211_radiotap_type {
 #define IEEE80211_RADIOTAP_F_TX_CTS	0x0002	/* used cts 'protection' */
 #define IEEE80211_RADIOTAP_F_TX_RTS	0x0004	/* used rts/cts handshake */
 
+/* For IEEE80211_RADIOTAP_RATE_MCS */
+#define IEEE80211_RADIOTAP_RATE_MCS_40MHZ	0x01 /* 40 MHz channel width */
+#define IEEE80211_RADIOTAP_RATE_MCS_SHORT_GI	0x02 /* short guard interval */
+
 #endif				/* IEEE80211_RADIOTAP_H */