diff --git a/sysadm/data-silos/cassandra/index.rst b/sysadm/data-silos/cassandra/index.rst
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+Cassandra
+=========
diff --git a/sysadm/data-silos/elasticsearch/index.rst b/sysadm/data-silos/elasticsearch/index.rst
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+ElasticSearch
+=============
diff --git a/sysadm/data-silos/index.rst b/sysadm/data-silos/index.rst
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+Data silos
+==========
+
+.. toctree::
+   :maxdepth: 2
+
+   postgresql/index
+   cassandra/index
+   kafka/index
+   elasticsearch/index
diff --git a/sysadm/data-silos/kafka/index.rst b/sysadm/data-silos/kafka/index.rst
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+Kafka
+=====
diff --git a/sysadm/data-silos/postgresql/index.rst b/sysadm/data-silos/postgresql/index.rst
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+PostgreSQL
+==========