diff --git a/wifi/supplicant/1.0/ISupplicantCallback.hal b/wifi/supplicant/1.0/ISupplicantCallback.hal
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+++ b/wifi/supplicant/1.0/ISupplicantCallback.hal
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+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.wifi.supplicant@1.0;
+
+/**
+ * Callback Interface exposed by the wpa_supplicant service (ISupplicant).
+ *
+ * Clients need to host an instance of this HIDL interface object and
+ * pass a reference of the object to wpa_supplicant via the
+ * |ISupplicant.registerCallback| method.
+ */
+interface ISupplicantCallback {
+  /**
+   * Used to indicate that a new interface has been created.
+   *
+   * @param ifName Name of the network interface, e.g., wlan0
+   */
+  oneway onInterfaceCreated(string ifName);
+
+  /**
+   * Used to indicate that an interface has been removed.
+   *
+   * @param ifName Name of the network interface, e.g., wlan0
+   */
+  oneway onInterfaceRemoved(string ifName);
+};