@@ -221,8 +221,16 @@ destination container.

 All new files and directories are created with mode 0755, uid and gid

 0.

+.. note::

+   if you build using STDIN (``docker build - < somefile``), there is no build 

+   context, so the Dockerfile cannot contain an ADD statement.

+

 The copy obeys the following rules:

+* The ``<src>`` path must be inside the *context* of the build; you cannot 

+  ``ADD ../something /something``, because the first step of a 

+  ``docker build`` is to send the context directory (and subdirectories) to 

+  the docker daemon.

 * If ``<src>`` is a URL and ``<dest>`` does not end with a trailing slash,

   then a file is downloaded from the URL and copied to ``<dest>``.

 * If ``<src>`` is a URL and ``<dest>`` does end with a trailing slash,