link to the staging civicrm site

service/crm.md

@@ -438,7 +438,7 @@ deploys a staging version at <https://donate.staging.torproject.net>.
 It's possible to fill in the donation form on this page, and use [Stripe test
 credit card numbers][] for the payment information. When a donation is
 submitted on this form, it should be processed by the PHP middleware and
-inserted into the staging CiviCRM instance. It should also be visible
+inserted into the [staging CiviCRM instance](https://staging.crm.torproject.org/). It should also be visible
 in the "test" Stripe interface.
 
 [Stripe test credit card numbers]: https://stripe.com/docs/testing?testing-method=card-numbers#cards