diff --git a/doc/production/CIRCUIT_RELAY.md b/doc/production/CIRCUIT_RELAY.md
index dc090502..400befb5 100644
--- a/doc/production/CIRCUIT_RELAY.md
+++ b/doc/production/CIRCUIT_RELAY.md
@@ -1,3 +1,7 @@
 # Circuit Relay
 
-TODO
\ No newline at end of file
+> Circuit Switching for libp2p, also known as TURN or Relay in Networking literature.
+
+If you are looking for information about libp2p's circuit relay, you should read its [spec](https://github.com/libp2p/specs/tree/master/relay).
+
+