diff --git a/README.md b/README.md
index 7ab8cac..534f7e0 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,9 @@ low-priority right now. Patches welcome!
 
 ## How to compile and run the code
 
-You will need the latest **prerelease** version of Racket. Any version
-newer than or equal to Racket 5.3.4.10 should work. Nightly-build
-installers for Racket can be downloaded
-[here](http://pre.racket-lang.org/installers/).
+You will need the latest version of Racket. Any version newer than or
+equal to Racket 6.0 should work. Racket releases can be downloaded
+[here](http://download.racket-lang.org/).
 
 Once you have Racket installed,
 
@@ -41,9 +40,11 @@ You can try out the service with
 
     dig @localhost -p 5444 localhost.example
 
-To enable debug output, try
+To enable debug output, set the `MATRIX_LOG` environment variable to
+`info`:
 
     MATRIX_LOG=info DNSPORT=5444 racket driver.rkt
+    MATRIX_LOG=info DNSPORT=5444 racket proxy.rkt
 
 ## Copyright and License