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-rw-r--r--synapse/storage/__init__.py12
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diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 2f29c4a112..a249ecd219 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -14,6 +14,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+"""
+The storage layer is split up into multiple parts to allow Synapse to run
+against different configurations of databases (e.g. single or multiple
+databases). The `data_stores` are classes that talk directly to a single
+database and have associated schemas, background updates, etc. On top of those
+there are (or will be) classes that provide high level interfaces that combine
+calls to multiple `data_stores`.
+
+There are also schemas that get applied to every database, regardless of the
+data stores associated with them (e.g. the schema version tables), which are
+stored in `synapse.storage.schema`.
+"""
 
 from synapse.storage.data_stores.main import DataStore  # noqa: F401