diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index 6f35d0417f1..33d2f729e1a 100644
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -335,7 +335,6 @@ pub fn then_with<F: FnOnce() -> Ordering>(self, f: F) -> Ordering {
 /// Example usage:
 ///
 /// ```
-/// #![feature(reverse_cmp_key)]
 /// use std::cmp::Reverse;
 ///
 /// let mut v = vec![1, 2, 3, 4, 5, 6];
@@ -343,10 +342,10 @@ pub fn then_with<F: FnOnce() -> Ordering>(self, f: F) -> Ordering {
 /// assert_eq!(v, vec![3, 2, 1, 6, 5, 4]);
 /// ```
 #[derive(PartialEq, Eq, Debug)]
-#[unstable(feature = "reverse_cmp_key", issue = "40893")]
+#[stable(feature = "reverse_cmp_key", since = "1.19.0")]
 pub struct Reverse<T>(pub T);
 
-#[unstable(feature = "reverse_cmp_key", issue = "40893")]
+#[stable(feature = "reverse_cmp_key", since = "1.19.0")]
 impl<T: PartialOrd> PartialOrd for Reverse<T> {
     #[inline]
     fn partial_cmp(&self, other: &Reverse<T>) -> Option<Ordering> {
@@ -363,7 +362,7 @@ fn ge(&self, other: &Self) -> bool { other.0 >= self.0 }
     fn gt(&self, other: &Self) -> bool { other.0 > self.0 }
 }
 
-#[unstable(feature = "reverse_cmp_key", issue = "40893")]
+#[stable(feature = "reverse_cmp_key", since = "1.19.0")]
 impl<T: Ord> Ord for Reverse<T> {
     #[inline]
     fn cmp(&self, other: &Reverse<T>) -> Ordering {