diff --git a/src/libcore/macros/mod.rs b/src/libcore/macros/mod.rs
index cf460745ffa..dd06da7a6d2 100644
--- a/src/libcore/macros/mod.rs
+++ b/src/libcore/macros/mod.rs
@@ -686,7 +686,7 @@ macro_rules! unimplemented {
 /// }
 /// ```
 #[macro_export]
-#[stable(feature = "todo_macro", since = "1.39.0")]
+#[stable(feature = "todo_macro", since = "1.40.0")]
 macro_rules! todo {
     () => (panic!("not yet implemented"));
     ($($arg:tt)+) => (panic!("not yet implemented: {}", $crate::format_args!($($arg)+)));
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 340313b06dd..9930b8f63af 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -524,8 +524,8 @@ pub use core::{
     unreachable,
     write,
     writeln,
-    // Unstable
     todo,
+    // Unstable
     matches,
 };