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diff --git a/README.org b/README.org
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--- a/README.org
+++ b/README.org
@@ -1,5 +1,11 @@
 This is my [[https://mitpress.mit.edu/sicp/][sicp]] sandbox.
 
+Exercises until 2.42 are written in GNU Guile Scheme. These are under
+the `net` directory.
+
+Exercises from 2.44 are written in Racket. These are under `ex`
+directory.
+
 * copying
 
 Unless specified otherwise, everything here is under