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diff --git a/arc/Readme b/arc/Readme.md
index a4f0e212..33ec3258 100644
--- a/arc/Readme
+++ b/arc/Readme.md
@@ -3,12 +3,16 @@ Original prototype, last modified 2015-03-14
 First install [Racket](http://racket-lang.org) (just for the initial
 prototype). Then:
 
+  ```shell
   $ cd mu/arc
   $ git clone http://github.com/arclanguage/anarki
   $ ./mu test mu.arc.t  # run tests
+  ```
 
 Example programs:
 
+  ```shell
   $ ./mu factorial.mu  # computes factorial of 5
   $ ./mu fork.mu  # two threads print '33' and '34' forever
   $ ./mu channel.mu  # two threads in a producer/consumer relationship
+  ```