@@ -251,6 +251,11 @@ All new files and directories are created with mode 0755, uid and gid

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

    context, so the Dockerfile can only contain an URL based ADD statement.

+.. note::

+   if your URL files are protected using authentication, you will need to use

+   an ``RUN wget`` , ``RUN curl`` or other tool from within the container as

+   ADD does not support authentication.

+

 The copy obeys the following rules:

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