diff --git a/example/extension/light/2.0/Android.bp b/example/extension/light/2.0/Android.bp
new file mode 100644
index 0000000..42f34f2
--- /dev/null
+++ b/example/extension/light/2.0/Android.bp
@@ -0,0 +1,47 @@
+// This file is autogenerated by hidl-gen. Do not edit manually.
+
+genrule {
+    name: "android.hardware.example.extension.light@2.0_genc++",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
+    srcs: [
+        "types.hal",
+        "IExtLight.hal",
+    ],
+    out: [
+        "android/hardware/example/extension/light/2.0/types.cpp",
+        "android/hardware/example/extension/light/2.0/ExtLightAll.cpp",
+    ],
+}
+
+genrule {
+    name: "android.hardware.example.extension.light@2.0_genc++_headers",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
+    srcs: [
+        "types.hal",
+        "IExtLight.hal",
+    ],
+    out: [
+        "android/hardware/example/extension/light/2.0/types.h",
+        "android/hardware/example/extension/light/2.0/IExtLight.h",
+        "android/hardware/example/extension/light/2.0/IHwExtLight.h",
+        "android/hardware/example/extension/light/2.0/BnExtLight.h",
+        "android/hardware/example/extension/light/2.0/BpExtLight.h",
+        "android/hardware/example/extension/light/2.0/BsExtLight.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.example.extension.light@2.0",
+    generated_sources: ["android.hardware.example.extension.light@2.0_genc++"],
+    generated_headers: ["android.hardware.example.extension.light@2.0_genc++_headers"],
+    export_generated_headers: ["android.hardware.example.extension.light@2.0_genc++_headers"],
+    shared_libs: [
+        "libhidl",
+        "libhwbinder",
+        "libutils",
+        "libcutils",
+        "android.hardware.light@2.0",
+    ],
+}
diff --git a/example/extension/light/2.0/Android.mk b/example/extension/light/2.0/Android.mk
new file mode 100644
index 0000000..75157a8
--- /dev/null
+++ b/example/extension/light/2.0/Android.mk
@@ -0,0 +1,178 @@
+# This file is autogenerated by hidl-gen. Do not edit manually.
+
+LOCAL_PATH := $(call my-dir)
+
+################################################################################
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := android.hardware.example.extension.light@2.0-java
+LOCAL_MODULE_CLASS := JAVA_LIBRARIES
+
+intermediates := $(local-generated-sources-dir)
+
+HIDL := $(HOST_OUT_EXECUTABLES)/hidl-gen$(HOST_EXECUTABLE_SUFFIX)
+
+LOCAL_JAVA_LIBRARIES := \
+    android.hardware.light@2.0-java \
+
+
+#
+# Build types.hal (Default)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/Default.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.Default
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build types.hal (ExtBrightness)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/ExtBrightness.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.ExtBrightness
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build types.hal (ExtLightState)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/ExtLightState.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.ExtLightState
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build IExtLight.hal
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/IExtLight.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/IExtLight.hal
+$(GEN): PRIVATE_DEPS += $(LOCAL_PATH)/types.hal
+$(GEN): $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::IExtLight
+
+$(GEN): $(LOCAL_PATH)/IExtLight.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+include $(BUILD_JAVA_LIBRARY)
+
+
+################################################################################
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := android.hardware.example.extension.light@2.0-java-static
+LOCAL_MODULE_CLASS := JAVA_LIBRARIES
+
+intermediates := $(local-generated-sources-dir)
+
+HIDL := $(HOST_OUT_EXECUTABLES)/hidl-gen$(HOST_EXECUTABLE_SUFFIX)
+
+LOCAL_STATIC_JAVA_LIBRARIES := \
+    android.hardware.light@2.0-java-static \
+
+
+#
+# Build types.hal (Default)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/Default.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.Default
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build types.hal (ExtBrightness)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/ExtBrightness.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.ExtBrightness
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build types.hal (ExtLightState)
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/ExtLightState.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::types.ExtLightState
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
+# Build IExtLight.hal
+#
+GEN := $(intermediates)/android/hardware/example/extension/light/2.0/IExtLight.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/IExtLight.hal
+$(GEN): PRIVATE_DEPS += $(LOCAL_PATH)/types.hal
+$(GEN): $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava -randroid.hardware:hardware/interfaces \
+        android.hardware.example.extension.light@2.0::IExtLight
+
+$(GEN): $(LOCAL_PATH)/IExtLight.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
diff --git a/example/extension/light/2.0/IExtLight.hal b/example/extension/light/2.0/IExtLight.hal
new file mode 100644
index 0000000..f12a272
--- /dev/null
+++ b/example/extension/light/2.0/IExtLight.hal
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 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.
+ */
+
+// Would normally be 'vendor.example.extension.light@2.0' however, this is
+// a google extension example. A vendor extension should also live in the
+// vendor partition.
+package android.hardware.example.extension.light@2.0;
+
+import android.hardware.light@2.0;
+
+interface IExtLight extends android.hardware.light@2.0::ILight {
+
+    /**
+     * Set the provided lights to the provided values.
+     *
+     * @param type logical light to set
+     * @param state describes what the light should look like.
+     * @return status result of applying state transformation.
+     */
+    setExtLight(Type type, ExtLightState state) generates (Status status);
+
+};
diff --git a/example/extension/light/2.0/default/Android.mk b/example/extension/light/2.0/default/Android.mk
new file mode 100644
index 0000000..fa68787
--- /dev/null
+++ b/example/extension/light/2.0/default/Android.mk
@@ -0,0 +1,17 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := android.hardware.example.extension.light@2.0-service
+LOCAL_INIT_RC := android.hardware.example.extension.light@2.0-service.rc
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := \
+    Light.cpp \
+
+LOCAL_SHARED_LIBRARIES := \
+    libhidl \
+    libhwbinder \
+    libutils \
+    android.hardware.light@2.0 \
+    android.hardware.example.extension.light@2.0 \
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/example/extension/light/2.0/default/Light.cpp b/example/extension/light/2.0/default/Light.cpp
new file mode 100644
index 0000000..d738a6d
--- /dev/null
+++ b/example/extension/light/2.0/default/Light.cpp
@@ -0,0 +1,56 @@
+#include "Light.h"
+
+namespace android {
+namespace hardware {
+namespace example {
+namespace extension {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+// Methods from ::android::hardware::light::V2_0::ILight follow.
+Return<Status> Light::setLight(Type type, const LightState& state)  {
+    // Forward types for new methods.
+
+    ExtLightState extState {
+        .state = state,
+        .interpolationOmega =
+            static_cast<int32_t>(Default::INTERPOLATION_OMEGA),
+        .brightness = // ExtBrightness inherits from Brightness
+            static_cast<ExtBrightness>(state.brightnessMode)
+    };
+
+    return setExtLight(type, extState);
+}
+
+Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb)  {
+    // implement unchanged method as you would always
+    hidl_vec<Type> vec{};
+
+    // ******************************************************
+    // Note: awesome proprietary hardware implementation here
+    // ******************************************************
+
+    _hidl_cb(vec);
+
+    return Void();
+}
+
+// Methods from ::android::hardware::example::extension::light::V2_0::ILight follow.
+Return<Status> Light::setExtLight(Type /* type */,
+                                  const ExtLightState& /* state */)  {
+
+    // ******************************************************
+    // Note: awesome proprietary hardware implementation here
+    // ******************************************************
+
+    return Status::SUCCESS;
+}
+
+} // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace extension
+}  // namespace example
+}  // namespace hardware
+}  // namespace android
diff --git a/example/extension/light/2.0/default/Light.h b/example/extension/light/2.0/default/Light.h
new file mode 100644
index 0000000..e09ec92
--- /dev/null
+++ b/example/extension/light/2.0/default/Light.h
@@ -0,0 +1,46 @@
+#ifndef HIDL_GENERATED_android_hardware_example_extension_light_V2_0_Light_H_
+#define HIDL_GENERATED_android_hardware_example_extension_light_V2_0_Light_H_
+
+#include <android/hardware/example/extension/light/2.0/IExtLight.h>
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+namespace android {
+namespace hardware {
+namespace example {
+namespace extension {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+using ::android::hardware::example::extension::light::V2_0::ExtLightState;
+using ::android::hardware::example::extension::light::V2_0::IExtLight;
+using ::android::hardware::light::V2_0::ILight;
+using ::android::hardware::light::V2_0::LightState;
+using ::android::hardware::light::V2_0::Status;
+using ::android::hardware::light::V2_0::Type;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::hidl_string;
+using ::android::sp;
+
+struct Light : public IExtLight {
+    // Methods from ::android::hardware::light::V2_0::ILight follow.
+    Return<Status> setLight(Type type, const LightState& state)  override;
+    Return<void> getSupportedTypes(getSupportedTypes_cb _hidl_cb)  override;
+
+    // Methods from ::android::hardware::example::extension::light::V2_0::ILight follow.
+    Return<Status> setExtLight(Type type, const ExtLightState& state)  override;
+
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace extension
+}  // namespace example
+}  // namespace hardware
+}  // namespace android
+
+#endif  // HIDL_GENERATED_android_hardware_example_extension_light_V2_0_Light_H_
diff --git a/example/extension/light/2.0/default/android.hardware.example.extension.light@2.0-service.rc b/example/extension/light/2.0/default/android.hardware.example.extension.light@2.0-service.rc
new file mode 100644
index 0000000..8a90d81
--- /dev/null
+++ b/example/extension/light/2.0/default/android.hardware.example.extension.light@2.0-service.rc
@@ -0,0 +1,4 @@
+service light-ext-2-0 /system/bin/hw/android.hardware.example.extension.light@2.0-service
+    class hal
+    user system
+    group system readproc
\ No newline at end of file
diff --git a/example/extension/light/2.0/default/service.cpp b/example/extension/light/2.0/default/service.cpp
new file mode 100644
index 0000000..55121d9
--- /dev/null
+++ b/example/extension/light/2.0/default/service.cpp
@@ -0,0 +1,34 @@
+#define LOG_TAG "android.hardware.light@2.0-service"
+#include <utils/Log.h>
+
+// #include <iostream>
+// #include <unistd.h>
+
+// #include <hidl/IServiceManager.h>
+// #include <hwbinder/IPCThreadState.h>
+// #include <hwbinder/ProcessState.h>
+// #include <utils/Errors.h>
+// #include <utils/StrongPointer.h>
+
+#include "Light.h"
+
+using android::sp;
+
+// libhwbinder:
+using android::hardware::IPCThreadState;
+using android::hardware::ProcessState;
+
+// Generated HIDL files
+using android::hardware::light::V2_0::ILight;
+
+int main() {
+    const char instance[] = "light";
+
+    android::sp<ILight> service = new Light();
+
+    service->registerAsService(instance);
+
+    ProcessState::self()->setThreadPoolMaxThreadCount(0);
+    ProcessState::self()->startThreadPool();
+    IPCThreadState::self()->joinThreadPool();
+}
diff --git a/example/extension/light/2.0/types.hal b/example/extension/light/2.0/types.hal
new file mode 100644
index 0000000..5be41bb
--- /dev/null
+++ b/example/extension/light/2.0/types.hal
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 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.example.extension.light@2.0;
+
+import android.hardware.light@2.0;
+
+enum Default : int32_t {
+    // for calls to setLight from the framework that don't know about this
+    // extension or its requirements
+    INTERPOLATION_OMEGA = 2
+};
+
+/**
+ * One possibility is renaming an old type. Another possibility is taking
+ * advantages of the different namespaces.
+ */
+enum ExtBrightness : Brightness {
+    /**
+     * Say we're really going to use the phone as a heater.
+     */
+    EXTREME,
+
+    /**
+     * Sometimes at night, we need it to be day.
+     */
+     THE_SUN,
+};
+
+/**
+ * Structs can't inherit eachother in hidl. Use composition instead. In this
+ * case, I won't use inheritence because I want to replace Brightness with
+ * ExtBrightness.
+ */
+struct ExtLightState {
+    LightState state;
+
+    /**
+     * This is the secret sauce that will really make this extension shine.
+     * No other person has such a cool feature in their hals. Don't forget
+     * to describe all details of parameters. An interface is a contract, and
+     * specifying this contract to the letter is what allows that contracted
+     * to be maintained. :)
+     *
+     * So, this parameter represents the speed at which brightness is changed
+     * to the new value in the three dimensional space with coordinates RGB
+     * from the red, blue, and green.
+     */
+    int32_t interpolationOmega;
+
+    /**
+     * Include new values.
+     */
+    ExtBrightness brightness;
+};