diff --git a/include/powermanager/IPowerManager.h b/include/powermanager/IPowerManager.h
index 91ecc5a..49ff637 100644
--- a/include/powermanager/IPowerManager.h
+++ b/include/powermanager/IPowerManager.h
@@ -25,12 +25,23 @@
 
 // ----------------------------------------------------------------------------
 
-// must be kept in sync with interface defined in IPowerManager.aidl
 class IPowerManager : public IInterface
 {
 public:
+    // These transaction IDs must be kept in sync with the method order from
+    // IPowerManager.aidl.
+    enum {
+        ACQUIRE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION,
+        ACQUIRE_WAKE_LOCK_UID = IBinder::FIRST_CALL_TRANSACTION + 1,
+        RELEASE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION + 2,
+        UPDATE_WAKE_LOCK_UIDS = IBinder::FIRST_CALL_TRANSACTION + 3,
+        POWER_HINT = IBinder::FIRST_CALL_TRANSACTION + 4,
+    };
+
     DECLARE_META_INTERFACE(PowerManager);
 
+    // The parcels created by these methods must be kept in sync with the
+    // corresponding methods from IPowerManager.aidl.
     // FIXME remove the bool isOneWay parameters as they are not oneway in the .aidl
     virtual status_t acquireWakeLock(int flags, const sp<IBinder>& lock, const String16& tag,
             const String16& packageName, bool isOneWay = false) = 0;
diff --git a/services/powermanager/Android.mk b/services/powermanager/Android.mk
index 7b24c65..4deb115 100644
--- a/services/powermanager/Android.mk
+++ b/services/powermanager/Android.mk
@@ -14,4 +14,6 @@
 
 LOCAL_CFLAGS += -Wall -Werror -Wunused -Wunreachable-code
 
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/../../include
+
 include $(BUILD_SHARED_LIBRARY)
diff --git a/services/powermanager/IPowerManager.cpp b/services/powermanager/IPowerManager.cpp
index ec864ee..0a4244f 100644
--- a/services/powermanager/IPowerManager.cpp
+++ b/services/powermanager/IPowerManager.cpp
@@ -27,15 +27,6 @@
 
 namespace android {
 
-// must be kept in sync with IPowerManager.aidl
-enum {
-    ACQUIRE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION,
-    ACQUIRE_WAKE_LOCK_UID = IBinder::FIRST_CALL_TRANSACTION + 1,
-    RELEASE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION + 2,
-    UPDATE_WAKE_LOCK_UIDS = IBinder::FIRST_CALL_TRANSACTION + 3,
-    POWER_HINT = IBinder::FIRST_CALL_TRANSACTION + 4,
-};
-
 class BpPowerManager : public BpInterface<IPowerManager>
 {
 public: