diff --git a/.env.production.sample b/.env.production.sample
index e022a8405..91fcce6ac 100644
--- a/.env.production.sample
+++ b/.env.production.sample
@@ -1,5 +1,6 @@
 # Service dependencies
 # You may set REDIS_URL instead for more advanced options
+# You may also set REDIS_NAMESPACE to share Redis between multiple Mastodon servers
 REDIS_HOST=redis
 REDIS_PORT=6379
 # You may set DATABASE_URL instead for more advanced options