diff --git a/build-constraints.yaml b/build-constraints.yaml
index f19c8f77..5b41a3cf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -527,6 +527,7 @@ packages:
         - regex-applicative
         - lexer-applicative
         - smallcheck
+        # Upper bound per https://github.com/fpco/stackage/issues/817
         - tasty < 0.11
         - tasty-golden
         - tasty-hunit