diff --git a/packages/mongo/README.md b/packages/mongo/README.md
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+# mongo
+
+The `mongo` package provides several paramount pieces of functionality to work
+with MongoDB in Meteor:
+
+- an efficient [Livequery][livequery] implementation providing real-time
+  updates from the database by consuming the MongoDB replication log
+- a fall-back Livequery implementation for cases when the replication log is not
+  available, implemented by polling the database
+- DDP RPC end-points for updating the data from clients connected over the wire
+- Serialization and deserialization of updates to the DDP format
+
+To learn more about [Livequery], see the project page on
+[www.meteor.com][livequery].
+
+XXX:
+[livequery]: https://www.meteor.com/projects/livequery
+