diff --git a/pkgs/development/compilers/elm/packages/release.nix b/pkgs/development/compilers/elm/packages/release.nix
index 742ada2481eb..531da88452fa 100644
--- a/pkgs/development/compilers/elm/packages/release.nix
+++ b/pkgs/development/compilers/elm/packages/release.nix
@@ -1,6 +1,8 @@
+# This file is auto-generated by ./update-elm.rb.
+# Please, do not modify it by hand!
 { callPackage }:
 {
-  version = "0.17.0";
+  version = "0.17";
   packages = {
     elm-compiler = callPackage ./elm-compiler.nix { };
     elm-package = callPackage ./elm-package.nix { };
diff --git a/pkgs/development/compilers/elm/update-elm.rb b/pkgs/development/compilers/elm/update-elm.rb
index 53dd0f88fa02..e27279604aef 100755
--- a/pkgs/development/compilers/elm/update-elm.rb
+++ b/pkgs/development/compilers/elm/update-elm.rb
@@ -14,6 +14,8 @@ for pkg, ver in $elm_packages
 end
 
 File.open("release.nix", 'w') do |file|
+  file.puts "# This file is auto-generated by ./update-elm.rb."
+  file.puts "# Please, do not modify it by hand!"
   file.puts "{ callPackage }:"
   file.puts "{"
   file.puts "  version = \"#{$elm_version}\";"