Update README.md

README.md

@@ -5,7 +5,7 @@ of queueing backends. These jobs can be everything from regularly scheduled
 clean-ups, billing charges, or mailings. Anything that can be chopped up into
 small units of work and run in parallel, really.
 
-It also serves as the backend for ActionMailer's #deliver_later functionality
+It also serves as the backend for [ActionMailer's #deliver_later functionality][https://github.com/rails/activejob/issues/13]
 that makes it easy to turn any mailing into a job for running later. That's
 one of the most common jobs in a modern web application: Sending emails outside
 of the request-response cycle, so the user doesn't have to wait on it.
@@ -34,7 +34,7 @@ That's it!
 
 ## GlobalID support
 
-Active Job supports GlobalID serialization for parameters. This makes it possible
+Active Job supports [GlobalID serialization][https://github.com/rails/activemodel-globalid/] for parameters. This makes it possible
 to pass live Active Record objects to your job instead of class/id pairs, which
 you then have to manually deserialize. Before, jobs would look like this: