examples: Explain reason for plainText()
diff --git a/examples/src/main/java/io/grpc/examples/helloworld/HelloWorldClient.java b/examples/src/main/java/io/grpc/examples/helloworld/HelloWorldClient.java
index e44b8b2..4b755da 100644
--- a/examples/src/main/java/io/grpc/examples/helloworld/HelloWorldClient.java
+++ b/examples/src/main/java/io/grpc/examples/helloworld/HelloWorldClient.java
@@ -51,6 +51,8 @@
/** Construct client connecting to HelloWorld server at {@code host:port}. */
public HelloWorldClient(String host, int port) {
channel = ManagedChannelBuilder.forAddress(host, port)
+ // Channels are secure by default (via SSL/TLS). For the example we disable TLS to avoid
+ // needing certificates.
.usePlaintext(true)
.build();
blockingStub = GreeterGrpc.newBlockingStub(channel);