diff --git a/thermal/aidl/default/Thermal.h b/thermal/aidl/default/Thermal.h
index 8885e63..d3d8874 100644
--- a/thermal/aidl/default/Thermal.h
+++ b/thermal/aidl/default/Thermal.h
@@ -46,6 +46,7 @@
 
     ndk::ScopedAStatus registerThermalChangedCallback(
             const std::shared_ptr<IThermalChangedCallback>& in_callback) override;
+
     ndk::ScopedAStatus registerThermalChangedCallbackWithType(
             const std::shared_ptr<IThermalChangedCallback>& in_callback,
             TemperatureType in_type) override;
@@ -53,9 +54,18 @@
     ndk::ScopedAStatus unregisterThermalChangedCallback(
             const std::shared_ptr<IThermalChangedCallback>& in_callback) override;
 
+    ndk::ScopedAStatus registerCoolingDeviceChangedCallbackWithType(
+            const std::shared_ptr<ICoolingDeviceChangedCallback>& in_callback,
+            CoolingType in_type) override;
+
+    ndk::ScopedAStatus unregisterCoolingDeviceChangedCallback(
+            const std::shared_ptr<ICoolingDeviceChangedCallback>& in_callback) override;
+
   private:
     std::mutex thermal_callback_mutex_;
     std::vector<std::shared_ptr<IThermalChangedCallback>> thermal_callbacks_;
+    std::mutex cdev_callback_mutex_;
+    std::vector<std::shared_ptr<ICoolingDeviceChangedCallback>> cdev_callbacks_;
 };
 
 }  // namespace example