diff --git a/wifi/hostapd/1.3/IHostapdCallback.hal b/wifi/hostapd/1.3/IHostapdCallback.hal
index 4db470d..98cde67 100644
--- a/wifi/hostapd/1.3/IHostapdCallback.hal
+++ b/wifi/hostapd/1.3/IHostapdCallback.hal
@@ -18,18 +18,34 @@
 
 import @1.1::IHostapdCallback;
 import @1.2::MacAddress;
+import Bandwidth;
 import Generation;
 
 /**
  * Top-level callback object for managing SoftAPs.
  */
 interface IHostapdCallback extends @1.1::IHostapdCallback {
-    oneway onInterfaceInfoChanged(string ifaceName, Generation generation);
+    /**
+     * Invoked when information changes for one of the AP instances.
+     *
+     * @param ifaceName Name of the interface which was added via
+     * |IHostapd.addAccessPoint|.
+     * @param apIfaceInstance The identity of the AP instance. The interface
+     * will have two instances (e.q. 2.4 Ghz AP and 5 GHz AP) in dual AP mode.
+     * The apIfaceInstance can be used to identify which instance the callback
+     * is from.
+     * Note: The apIfaceInstance must be same as ifaceName in single AP mode.
+     * @param freq The operational frequency of the AP.
+     * @param bandwidth The operational bandwidth of the AP.
+     * @param generation The operational mode of the AP (e.g. 11ac, 11ax).
+     */
+    oneway onApInstanceInfoChanged(string ifaceName, string apIfaceInstance, uint32_t freq,
+        Bandwidth bandwidth, Generation generation);
 
     /**
      * Invoked when a client connects/disconnects from the hotspot.
      *
-     * @param ifaceName Name of the interface which is added via
+     * @param ifaceName Name of the interface which was added via
      * |IHostapd.addAccessPoint|.
      * @param apIfaceInstance The identity of the AP instance. The interface
      * will have two instances in dual AP mode. The apIfaceInstance can be used
diff --git a/wifi/hostapd/1.3/types.hal b/wifi/hostapd/1.3/types.hal
index 887ea0f..de85043 100644
--- a/wifi/hostapd/1.3/types.hal
+++ b/wifi/hostapd/1.3/types.hal
@@ -17,7 +17,7 @@
 package android.hardware.wifi.hostapd@1.3;
 
 /**
- * The wifi generation which AP reside on.
+ * The wifi operational mode of the AP.
  * It depends on hw mode and HT/VHT capabilities in hostapd.
  *
  * WIFI_STANDARD_LEGACY = (hw_mode is HOSTAPD_MODE_IEEE80211B) or
@@ -34,3 +34,16 @@
     WIFI_STANDARD_11AC = 2,
     WIFI_STANDARD_11AX = 3,
 };
+
+/**
+ * The channel bandwidth of the AP.
+ */
+enum Bandwidth : uint32_t {
+    WIFI_BANDWIDTH_INVALID = 0,
+    WIFI_BANDWIDTH_20_NOHT = 1,
+    WIFI_BANDWIDTH_20 = 2,
+    WIFI_BANDWIDTH_40 = 3,
+    WIFI_BANDWIDTH_80 = 4,
+    WIFI_BANDWIDTH_80P80 = 5,
+    WIFI_BANDWIDTH_160 = 6,
+};