diff --git a/pkgs/development/tools/haskell/haskell-docs/default.nix b/pkgs/development/tools/haskell/haskell-docs/default.nix
index e77a9ffe21e..b9cd34c716e 100644
--- a/pkgs/development/tools/haskell/haskell-docs/default.nix
+++ b/pkgs/development/tools/haskell/haskell-docs/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, aeson, Cabal, filepath, ghcPaths, haddock, monadLoops
 , text, unorderedContainers
 }: