diff --git a/non_module_deps.bzl b/non_module_deps.bzl
index fa06d4465..87fb9903d 100644
--- a/non_module_deps.bzl
+++ b/non_module_deps.bzl
@@ -1,6 +1,8 @@
+"""Modules for dependencies not included in the Bazel Central Registry"""
+
 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
 
-def _non_module_deps_impl(ctx):
+def _non_module_deps_impl(_):
     # FMDB is used to access SQLite from Objective-C(++) code.
     git_repository(
         name = "FMDB",