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+########################################
+update-sources - Update the source index
+########################################
+
+Synopsis
+========
+
+::
+
+   suricata-update update-sources
+
+Description
+===========
+
+The ``update-sources`` command downloads the latest index of available
+sources.
+
+Options
+=======
+
+.. include:: common-options.rst
+
+Files and Directories
+=====================
+
+``/var/lib/suricata/rules/.cache/index.yaml``
+  Where the downloaded source index is cached.
+  
+Environment Variables
+=====================
+
+**SOURCE_INDEX_URL**
+  This environment variable allows the specification of an alternate
+  URL to download the index from.
+
+URLs
+====
+
+``https://www.openinfosecfoundation.org/rules/index.yaml``
+  The default URL used to download the index from.