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-rw-r--r--docs/tcp_replication.md15
1 files changed, 14 insertions, 1 deletions
diff --git a/docs/tcp_replication.md b/docs/tcp_replication.md
index e099d8a87b..ba9e874d07 100644
--- a/docs/tcp_replication.md
+++ b/docs/tcp_replication.md
@@ -199,7 +199,20 @@ client (C):
 
 #### REPLICATE (C)
 
-   Asks the server to replicate a given stream
+Asks the server to replicate a given stream. The syntax is:
+
+```
+    REPLICATE <stream_name> <token>
+```
+
+Where `<token>` may be either:
+ * a numeric stream_id to stream updates since (exclusive)
+ * `NOW` to stream all subsequent updates.
+
+The `<stream_name>` is the name of a replication stream to subscribe 
+to (see [here](../synapse/replication/tcp/streams/_base.py) for a list
+of streams). It can also be `ALL` to subscribe to all known streams,
+in which case the `<token>` must be set to `NOW`.
 
 #### USER_SYNC (C)