diff --git a/examples/angular/tools/ngsw_config.bzl b/examples/angular/tools/ngsw_config.bzl
index b99d56397b..d63569b0de 100644
--- a/examples/angular/tools/ngsw_config.bzl
+++ b/examples/angular/tools/ngsw_config.bzl
@@ -3,6 +3,7 @@
 load("@build_bazel_rules_nodejs//:index.bzl", "nodejs_binary")
 
 def ngsw_config(name, config, index_html, src, out = None, **kwargs):
+    "Creates ngsw.json with service worker configuration and hashes for all source files"
     if not out:
         out = name