diff --git a/thermal/2.0/IThermalChangedCallback.hal b/thermal/2.0/IThermalChangedCallback.hal
new file mode 100644
index 0000000..b06bfbf
--- /dev/null
+++ b/thermal/2.0/IThermalChangedCallback.hal
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018 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.thermal@2.0;
+
+import android.hardware.thermal@2.0::Temperature;
+
+/**
+ * IThermalChangedCallback send throttling notification to clients.
+ */
+interface IThermalChangedCallback {
+    /**
+     * Send a thermal throttling event to all ThermalHAL
+     * thermal event listeners.
+     *
+     * @param temperature The temperature associated with the
+     *    throttling event.
+     */
+    oneway notifyThrottling (Temperature temperature);
+};