diff --git a/lib/active_job/enqueuing.rb b/lib/active_job/enqueuing.rb
index 94a9dbf8ab..324385216e 100644
--- a/lib/active_job/enqueuing.rb
+++ b/lib/active_job/enqueuing.rb
@@ -2,8 +2,16 @@ require 'active_job/parameters'
 
 module ActiveJob
   module Enqueuing
+    ##
+    # Push a job onto the queue.  The arguments must be legal JSON types
+    # (string, int, float, nil, true, false, hash or array) or
+    # ActiveModel::GlobalIdentication instances.  Arbitrary Ruby objects
+    # are not supported.
+    #
+    # The return value is adapter-specific and may change in a future
+    # ActiveJob release.
     def enqueue(*args)
       queue_adapter.queue self, *Parameters.serialize(args)
     end
   end
-end
\ No newline at end of file
+end