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diff --git a/TODO b/TODO
index af1b38734c..8d1dfb1394 100644
--- a/TODO
+++ b/TODO
@@ -121,6 +121,11 @@ etc.
 Tests that need to download stuff or otherwise take a long time would only be
 run when that is defined.
 
+* add "guix challenge"
+
+Would download a substitute, and compare its contents against a (hopefully
+locally-built) copy.
+
 * guix package
 
 ** add ‘--list-generations’, and ‘--delete-generations’