diff --git a/docs/CONFIG.md b/docs/CONFIG.md
index 3d5037a2..bd001743 100644
--- a/docs/CONFIG.md
+++ b/docs/CONFIG.md
@@ -13,6 +13,9 @@ You can configure MailHog using command line options or environment variables:
 | MH_MONGO_COLLECTION | -mongo-coll     | messages        | MongoDB collection name for message storage
 | MH_MONGO_DB         | -mongo-db       | mailhog         | MongoDB database name for message storage
 | MH_MONGO_URI        | -mongo-uri      | 127.0.0.1:27017 | MongoDB host and port
+| MH_MONGO_RETRIES    | -mongo-retries  | 3               | Number of attempts to connect to MongoDB
+| MH_MONGO_RETRY_INTERVAL | -mongo-retry-interval | 10 | Interval between connection attempts to MongoDB (in seconds)
+| MH_MONGO_IN_MEMORY_FALLBACK | -mongo-in-memory-fallback | false | Use in-memory storage if connection to MongoDB fails (true) or exit (false)
 | MH_SMTP_BIND_ADDR   | -smtp-bind-addr | 0.0.0.0:1025    | Interface and port for SMTP server to bind to
 | MH_STORAGE          | -storage        | memory          | Set message storage: memory / mongodb / maildir
 | MH_OUTGOING_SMTP    | -outgoing-smtp  |                 | JSON file defining outgoing SMTP servers