diff --git a/build-constraints.yaml b/build-constraints.yaml
index 077b320c..f7945ed7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3291,6 +3291,7 @@ packages:
         - lifted-async < 0.10
 
         # https://github.com/fpco/stackage/issues/3290
+        # also blocked by QuickCheck < 2.11
         - doctest < 0.14
 
         # https://github.com/fpco/stackage/issues/3292