diff --git a/build-constraints.yaml b/build-constraints.yaml
index 34af39bc..f518e834 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4465,6 +4465,7 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/4056
         - postgresql-simple < 0.6
 
+        # https://github.com/commercialhaskell/stackage/issues/4066
         - generics-sop < 0.4.0.0
 
 # end of packages