fix broken link
diff --git a/examples/README.md b/examples/README.md
index 84ec800..cd85417 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -447,4 +447,4 @@
## Read more!
- You can find links to language-specific tutorials, examples, and other docs in each language's [quick start](#quickstart).
-- [gRPC Authentication Support](doc/grpc-auth-support.md) introduces authentication support in gRPC with supported mechanisms and examples.
+- [gRPC Authentication Support](http://www.grpc.io/docs/guides/auth.html) introduces authentication support in gRPC with supported mechanisms and examples.