diff --git a/src/common/qca-vendor.h b/src/common/qca-vendor.h
index 778c217fb..557b52562 100644
--- a/src/common/qca-vendor.h
+++ b/src/common/qca-vendor.h
@@ -1189,7 +1189,9 @@ enum qca_wlan_vendor_attr_p2p_listen_offload {
  *
  * @QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG0_CENTER_CHANNEL: Required (u8).
  * Used with event to notify the VHT segment 0 center channel number selected in
- * ACS operation.
+ * ACS operation. The value is the index of the channel center frequency for
+ * 20 MHz, 40 MHz, and 80 MHz channels. The value is the center frequency index
+ * of the primary 80 MHz segment for 160 MHz and 80+80 MHz channels.
  * Note: If both the driver and user-space application supports the 6 GHz band,
  * QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG0_CENTER_CHANNEL is deprecated; use
  * QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG0_CENTER_FREQUENCY instead.
@@ -1199,7 +1201,10 @@ enum qca_wlan_vendor_attr_p2p_listen_offload {
  *
  * @QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG1_CENTER_CHANNEL: Required (u8).
  * Used with event to notify the VHT segment 1 center channel number selected in
- * ACS operation.
+ * ACS operation. The value is zero for 20 MHz, 40 MHz, and 80 MHz channels.
+ * The value is the index of the channel center frequency for 160 MHz channels
+ * and the center frequency index of the secondary 80 MHz segment for 80+80 MHz
+ * channels.
  * Note: If both the driver and user-space application supports the 6 GHz band,
  * QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG1_CENTER_CHANNEL is deprecated; use
  * QCA_WLAN_VENDOR_ATTR_ACS_VHT_SEG1_CENTER_FREQUENCY instead.
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index c37dd2fc9..9bdf88011 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -5707,7 +5707,15 @@ union wpa_event_data {
 	 * @pri_freq: Selected primary frequency
 	 * @sec_freq: Selected secondary frequency
 	 * @vht_seg0_center_ch: VHT mode Segment0 center channel
+	 *	The value is the index of the channel center frequency for
+	 *	20 MHz, 40 MHz, and 80 MHz channels. The value is the center
+	 *	frequency index of the primary 80 MHz segment for 160 MHz and
+	 *	80+80 MHz channels.
 	 * @vht_seg1_center_ch: VHT mode Segment1 center channel
+	 *	The value is zero for 20 MHz, 40 MHz, and 80 MHz channels. The
+	 *	value is the index of the channel center frequency for 160 MHz
+	 *	channels and the center frequency index of the secondary 80 MHz
+	 *	segment for 80+80 MHz channels.
 	 * @ch_width: Selected Channel width by driver. Driver may choose to
 	 *	change hostapd configured ACS channel width due driver internal
 	 *	channel restrictions.