diff --git a/src/doc/intro.md b/src/doc/intro.md
index b5e5fab7469..98ce6e1466d 100644
--- a/src/doc/intro.md
+++ b/src/doc/intro.md
@@ -546,7 +546,7 @@ fn main() {
     for i in range(0u, 3) {
         Thread::spawn(move || {
             println!("{}", vec[i]);
-        }).detach();
+        });
     }
 }
 ```