diff --git a/pkgs/development/libraries/haskell/blaze-from-html/default.nix b/pkgs/development/libraries/haskell/blaze-from-html/default.nix
index 42861df6f4c..4897e750556 100644
--- a/pkgs/development/libraries/haskell/blaze-from-html/default.nix
+++ b/pkgs/development/libraries/haskell/blaze-from-html/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, filepath, tagsoup }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/deepseq-th/default.nix b/pkgs/development/libraries/haskell/deepseq-th/default.nix
index 5fa23a8afda..efa3057291d 100644
--- a/pkgs/development/libraries/haskell/deepseq-th/default.nix
+++ b/pkgs/development/libraries/haskell/deepseq-th/default.nix
@@ -9,8 +9,6 @@ cabal.mkDerivation (self: {
   buildDepends = [ deepseq ];
   testDepends = [ deepseq ];
   jailbreak = true;
-  # TH semantics is a little bit different in GHC 7.8
-  # tests needs updating, but the package is still working
   doCheck = false;
   meta = {
     description = "Template Haskell based deriver for optimised NFData instances";
diff --git a/pkgs/development/libraries/haskell/system-filepath/default.nix b/pkgs/development/libraries/haskell/system-filepath/default.nix
index 5934378c94e..e064ebe7357 100644
--- a/pkgs/development/libraries/haskell/system-filepath/default.nix
+++ b/pkgs/development/libraries/haskell/system-filepath/default.nix
@@ -8,7 +8,6 @@ cabal.mkDerivation (self: {
   sha256 = "0sfralwgd5b9hfqmp20v31sq96s0v7j9g920qdj3n9i5mhslhwd2";
   buildDepends = [ deepseq text ];
   testDepends = [ chell chellQuickcheck QuickCheck text ];
-  # tests fragile on 32-bits
   doCheck = false;
   meta = {
     homepage = "https://john-millikin.com/software/haskell-filesystem/";