diff --git a/release_notes.md b/release_notes.md
index 8874258..feec5c6 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -15,4 +15,13 @@ This file tracks release notes for the loop client.
 
 #### Breaking Changes
 
+* Macaroon authentication has been enabled for the `loopd` gRPC and REST
+  connections. This makes it possible for the loop API to be exposed safely over
+  the internet as unauthorized access is now prevented.
+  
+  The daemon will write a default `loop.macaroon` in its main directory. For
+  mainnet this file will be picked up automatically by the `loop` CLI tool. For
+  testnet you need to specify the `--network=testnet` flag.
+  [More information about TLS and macaroons.](README.md#authentication-and-transport-security)
+
 #### Bug Fixes
\ No newline at end of file