| Index: devil/devil/android/device_errors.py | 
| diff --git a/devil/devil/android/device_errors.py b/devil/devil/android/device_errors.py | 
| index 568e497496e3930b3710b0ca8d5e09a1bc2c4b7b..57f361503a44cec9178004f2da067360ab47506b 100644 | 
| --- a/devil/devil/android/device_errors.py | 
| +++ b/devil/devil/android/device_errors.py | 
| @@ -4,6 +4,22 @@ | 
|  | 
| """ | 
| Exception classes raised by AdbWrapper and DeviceUtils. | 
| + | 
| +The class hierarchy for device exceptions is: | 
| + | 
| +    base_error.BaseError | 
| +     +-- CommandFailedError | 
| +     |    +-- AdbCommandFailedError | 
| +     |    |    +-- AdbShellCommandFailedError | 
| +     |    +-- FastbootCommandFailedError | 
| +     |    +-- DeviceVersionError | 
| +     |    +-- DeviceChargingError | 
| +     +-- CommandTimeoutError | 
| +     +-- DeviceUnreachableError | 
| +     +-- NoDevicesError | 
| +     +-- MultipleDevicesError | 
| +     +-- NoAdbError | 
| + | 
| """ | 
|  | 
| from devil import base_error | 
|  |