mongoid.yml in mongoid-6.4.1

- old
+ new

@@ -9,9 +9,13 @@
       # Provides the hosts the default client can connect to. Must be an array
       # of host:port pairs. (required)
       hosts:
         - localhost:27017
       options:
+        # Note that all options listed below are Ruby driver client options (the mongo gem).
+        # Please refer to the driver documentation of the version of the mongo gem you are using
+        # for the most up-to-date list of options.
+        #
         # Change the default write concern. (default = { w: 1 })
         # write:
         #   w: 1
 
         # Change the default read preference. Valid options for mode are: :secondary,