comment on where to look to view 'Hello World' message

examples/hello_world.rs

diff --git a/examples/hello_world.rs b/examples/hello_world.rs
index 4a67404..bc7a2a6 100644
--- a/examples/hello_world.rs
+++ b/examples/hello_world.rs
@@ -1,4 +1,5 @@
 // This example just prints "Hello Tock World" to the terminal.
+// Run `tockloader listen` to view the message.
 
 #![no_std]