diff --git a/src/common/qca-vendor.h b/src/common/qca-vendor.h
index ad5dac2d1..6f5b87e7f 100644
--- a/src/common/qca-vendor.h
+++ b/src/common/qca-vendor.h
@@ -852,6 +852,12 @@ enum qca_wlan_vendor_attr {
 	 * to report the corresponding antenna index to the chain RSSI value
 	 */
 	QCA_WLAN_VENDOR_ATTR_ANTENNA_INFO = 40,
+	/* Used in QCA_NL80211_VENDOR_SUBCMD_GET_CHAIN_RSSI command to report
+	 * the specific antenna EVM value (unsigned 32 bit value). With a
+	 * determinate group of antennas, the driver specifies the EVM value
+	 * for each antenna ID, and application extract them in user space.
+	 */
+	QCA_WLAN_VENDOR_ATTR_CHAIN_EVM = 41,
 
 	/* keep last */
 	QCA_WLAN_VENDOR_ATTR_AFTER_LAST,