diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5a931bd6..6f66d550 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1678,6 +1678,7 @@ skipped-tests:
     # https://github.com/fpco/stackage/issues/602
     - aws
 
+    # doctest < 0.10
     # https://github.com/fpco/stackage/issues/622
     - bound
     - heaps
@@ -1690,7 +1691,7 @@ skipped-tests:
     # https://github.com/fpco/stackage/issues/668
     - second-transfer
 
-    # Require old tasty.
+    # tasty < 0.11
     # https://github.com/fpco/stackage/issues/817
     - tar
     - uuid