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diff --git a/README b/README
index 69b34be..e81ca46 100644
--- a/README
+++ b/README
@@ -33,6 +33,7 @@
       - Guile 2.0 or better.
       - PLT Racket 6.0 or better.
       - Chicken 4.8.0 or better.
+      - MIT/GNU Scheme 9.2 or better
 
 * Installation