docs/guide: Explain the sim_interferometer config file

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diff --git a/docs/guide.rst b/docs/guide.rst
index f0a2a07..d1a4d5d 100644
--- a/docs/guide.rst
+++ b/docs/guide.rst
@@ -100,6 +100,9 @@ The simulated *visibility data* are then imaged by utilizing the
 
    The ``<freq>`` is the frequency (in units of MHz) of the input
    sky image.
+   The ``sim_interferometer.base.ini`` is the basic configuration
+   file for ``oskar_sim_interferometer`` tool in OSKAR.
+   Here is an `example config file <https://github.com/liweitianux/atoolbox/blob/master/astro/oskar/sim_interferometer.base.ini>`_.
    The simulated visibility data will be located at
    ``visibility/example.ms``.