diff --git a/build-constraints.yaml b/build-constraints.yaml
index 15819f62..1ecd02b0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -749,7 +749,8 @@ packages:
 
     "Nikita Volkov <nikita.y.volkov@mail.ru>":
         - base-prelude
-        - cases
+        # https://github.com/nikita-volkov/cases/issues/2
+        # GHC 8 - cases
         - focus
         # GHC 8 - hasql
         - list-t
@@ -1917,7 +1918,8 @@ packages:
         - pgp-wordlist
 
     "Jeremy Shaw <jeremy@n-heptane.com> @stepcut":
-        - boomerang
+        # https://github.com/Happstack/boomerang/issues/2
+        # GHC 8 - boomerang
         # GHC 8 - clckwrks
         # GHC 8 - clckwrks-cli
         # GHC 8 - clckwrks-plugin-page