diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs
index 948ad104cdf2f2e409ad6e5a40c87235f689d4be..f00128a8147de4231622539c01c3c87ba33937ad 100644
--- a/src/libcore/macros.rs
+++ b/src/libcore/macros.rs
@@ -330,6 +330,7 @@
 /// // The prefered method of quick returning Errors
 /// fn write_to_file_question() -> Result<(), MyError> {
 ///     let mut file = File::create("my_best_friends.txt")?;
+///     file.write_all(b"This is a list of my best friends.")?;
 ///     Ok(())
 /// }
 ///