diff --git a/src/doc/rustdoc/src/write-documentation/what-to-include.md b/src/doc/rustdoc/src/write-documentation/what-to-include.md
index 4bcae4d222c79..75d3b7dae61ed 100644
--- a/src/doc/rustdoc/src/write-documentation/what-to-include.md
+++ b/src/doc/rustdoc/src/write-documentation/what-to-include.md
@@ -73,7 +73,7 @@ and your test suite, this example needs some additional code:
 ``````text
 /// Example
 /// ```rust
-/// # main() -> Result<(), std::num::ParseIntError> {
+/// # fn main() -> Result<(), std::num::ParseIntError> {
 /// let fortytwo = "42".parse::<u32>()?;
 /// println!("{} + 10 = {}", fortytwo, fortytwo+10);
 /// #     Ok(())