update name of binary in Quick Start section
diff --git a/Modules.md b/Modules.md
index e7cf095..bac39d4 100644
--- a/Modules.md
+++ b/Modules.md
@@ -116,7 +116,7 @@
 
 Build and run:
 ```
-$ go build 
+$ go build -o hello
 $ ./hello
 
 Hello, world.