Update README.md

Author: jcheese1

README.md

@@ -83,7 +83,9 @@ CLOUDFLARE_EMAIL=your-cloudflare-email
 
 in Settings -> Secrets -> Actions -> New repository secret.
 
-Now add 'production' and 'staging' environments in github as well, by going to Settings -> Environments -> New environment. Add secrets there.
+Now add 'production' and 'staging' environments in github as well, by going to Settings -> Environments -> New environment. Add secrets there. You will no longer manage secrets in the workers dashboard, it will all be consolidated here.
+
+all preview environments (PRs) will use the staging environment variable.
 
 Now add the newly added secrets to the github actions workflow under `env`.