diff --git a/lib/collection.js b/lib/collection.js
index b0335bc6..c6d954e4 100644
--- a/lib/collection.js
+++ b/lib/collection.js
@@ -292,6 +292,9 @@ Collection.prototype.group = function (keys, condition, initial, reduce, finaliz
     fn = opts
     opts = {}
   }
+
+  console.warn('DEPRECATED (collection.group): MongoDB 3.6 or higher no longer supports the group command. We recommend rewriting using the aggregation framework.')
+
   return this._dispatch(function group (args) {
     return args.col.group(args.keys, args.condition, args.initial, args.reduce, args.finalize, args.command, args.options)
   })({options: opts, keys: keys, condition: condition, initial: initial, reduce: reduce, finalize: finalize, command: command, callback: fn}, 'group')