diff --git a/src/doc/src/reference/unstable.md b/src/doc/src/reference/unstable.md
index 49d3e007ef4f..73e51361a450 100644
--- a/src/doc/src/reference/unstable.md
+++ b/src/doc/src/reference/unstable.md
@@ -1407,7 +1407,7 @@ fn main() {}
 
 A user may optionally specify a manifest in a `cargo` code fence in a module-level comment, like:
 ```rust
-#!/usr/bin/env cargo
+#!/usr/bin/env cargo +nightly -Zscript
 
 //! ```cargo
 //! [dependencies]