message: Add a note explaining that executing things directly with bazel may require additional pyhton packages.
diff: @@ -180,7 +180,7 @@ If bazel is not installed on your system, install it now by following
  ### Install python dependencies
  -To install TensorFlow, you must install the following packages:
  +To build TensorFlow, you must install the following packages:
  * six
  * numpy, which is a numerical processing package that TensorFlow requires.
  @@ -196,7 +196,11 @@ After installing pip, invoke the following commands:
  <pre> $ <b>sudo pip install six numpy wheel</b> </pre>
  -
  +Note: These are just the minimum requirements to _build_ tensorflow. Installing
  +the pip package will download additional packages required to _run_ it. If you
  +plan on executing tasks directly with `bazel` , without the pip installation,
  +you may need to install additional python packages. For example, you should
  +`pip install mock enum34` before running TensorFlow's tests with bazel.
  ### Optional: install TensorFlow for GPU prerequisites
  