diff --git a/build-constraints.yaml b/build-constraints.yaml
index eb2c2148..92b4b5c5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -9163,7 +9163,7 @@ skipped-benchmarks:
     - vector-binary-instances
 
     # Misc dependency issues
-    - heftia-effects # requires "eff" package -- doesn't exist?
+    - heftia-effects # requires https://github.com/hasura/eff (?) -- not on hackage
 
     # Timeouts
     - gogol-youtube