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diff --git a/testsuite/tests/stranal/sigs/T16197b.hs b/testsuite/tests/stranal/sigs/T16197b.hs
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+++ b/testsuite/tests/stranal/sigs/T16197b.hs
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+-- | The same as T16197, but a bit more distilled.
+-- Important takeaway: The signature of `f` may not say "strict in the Bool
+-- field of T", otherwise the Simplifier will drop the `seq` on the `Bool` at
+-- call sites after unboxing the `T`.
+module T16197b where
+
+data T = T !Bool
+data Box a = Box a
+
+f :: T -> Box Bool
+f (T b) = Box b
+{-# NOINLINE f #-} -- I like NOINLINE better than artificial recursion, YMMV