diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 5b8d14b7f47..2dff208ae07 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1390,7 +1390,7 @@ self: super: {
     })
   ];
 
-  # https://github.com/serokell/nixfmt/pull/62
+  # 2020-06-22: NOTE: > 0.4.0 => rm Jailbreak: https://github.com/serokell/nixfmt/issues/71
   nixfmt = doJailbreak super.nixfmt;
 
   # 2020-06-22: NOTE: QuickCheck upstreamed https://github.com/phadej/binary-instances/issues/7