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-rw-r--r--arc/Readme.md7
1 files changed, 5 insertions, 2 deletions
diff --git a/arc/Readme.md b/arc/Readme.md
index 4fafbcdb..f0d614a5 100644
--- a/arc/Readme.md
+++ b/arc/Readme.md
@@ -1,11 +1,14 @@
 Original prototype, last modified 2015-03-14
 
-First install [Racket](http://racket-lang.org) (just for this prototype).
-Then:
+First install [Racket](http://racket-lang.org) (just for this prototype;
+last tested with v6.3). Then:
 
   ```shell
   $ cd mu/arc
   $ git clone http://github.com/arclanguage/anarki
+  $ cd anarki
+  $   git checkout d7290130a7  # last compatible snapshot
+  $ cd ..
   $ ./mu test mu.arc.t  # run tests
   ```