diff --git a/library/core/src/cmp.rs b/library/core/src/cmp.rs
index feb9c43196044..d61e1071db8b6 100644
--- a/library/core/src/cmp.rs
+++ b/library/core/src/cmp.rs
@@ -1186,7 +1186,7 @@ pub macro Ord($item:item) {
 /// every `a`. This isn't always the case for types that implement `PartialOrd`, for example:
 ///
 /// ```
-/// let a = f64::sqrt(-1.0);
+/// let a = f64::NAN;
 /// assert_eq!(a <= a, false);
 /// ```
 ///