diff --git a/src/addr.rs b/src/addr.rs
index 8a8165b..9ca3861 100644
--- a/src/addr.rs
+++ b/src/addr.rs
@@ -46,13 +46,13 @@ impl<T> MemoryAddr for T where T: Copy + From<usize> + Into<usize> {}
 ///     pub type ExampleAddr;
 /// }
 ///
-/// fn main() {
-///     const EXAMPLE: ExampleAddr = ExampleAddr::from_usize(0x1234);
-///     const EXAMPLE_USIZE: usize = EXAMPLE.as_usize();
-///     assert_eq!(EXAMPLE_USIZE, 0x1234);
-///     assert_eq!(EXAMPLE.align_down(0x10usize), ExampleAddr::from_usize(0x1230));
-///     assert_eq!(EXAMPLE.align_up_4k(), ExampleAddr::from_usize(0x2000));
-/// }
+/// # fn main() {
+/// const EXAMPLE: ExampleAddr = ExampleAddr::from_usize(0x1234);
+/// const EXAMPLE_USIZE: usize = EXAMPLE.as_usize();
+/// assert_eq!(EXAMPLE_USIZE, 0x1234);
+/// assert_eq!(EXAMPLE.align_down(0x10usize), ExampleAddr::from_usize(0x1230));
+/// assert_eq!(EXAMPLE.align_up_4k(), ExampleAddr::from_usize(0x2000));
+/// # }
 /// ```
 #[macro_export]
 macro_rules! def_usize_addr {