diff --git a/pkgs/development/python-modules/mypy-protobuf_3_6/default.nix b/pkgs/development/python-modules/mypy-protobuf_3_6/default.nix
index d51ab7a1a898..221f22aa988b 100644
--- a/pkgs/development/python-modules/mypy-protobuf_3_6/default.nix
+++ b/pkgs/development/python-modules/mypy-protobuf_3_6/default.nix
@@ -13,6 +13,8 @@
 buildPythonPackage (finalAttrs: {
   pname = "mypy-protobuf";
   version = "3.6.0";
+  # nixpkgs-update: no auto update
+  # this is a pinned version
   pyproject = true;
 
   src = fetchFromGitHub {