diff --git a/build-constraints.yaml b/build-constraints.yaml
index d06d60a4..39300eb0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3911,7 +3911,7 @@ packages:
 
         # https://github.com/kuribas/cubicbezier/issues/9
         # waiting on cubicbezier
-        # matrices < 0.5
+        - matrices < 0.5 # build failure because of cubicbezier
 
         # https://github.com/commercialhaskell/stackage/issues/4290
         - http-client < 0.6