diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
index 6fc26bb7eed71..624748f352ee1 100644
--- a/src/libstd/num/f32.rs
+++ b/src/libstd/num/f32.rs
@@ -1030,7 +1030,7 @@ impl f32 {
     /// let abs_difference_1 = (f.1 - x.cos()).abs();
     ///
     /// assert!(abs_difference_0 <= f32::EPSILON);
-    /// assert!(abs_difference_0 <= f32::EPSILON);
+    /// assert!(abs_difference_1 <= f32::EPSILON);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
diff --git a/src/libstd/num/f64.rs b/src/libstd/num/f64.rs
index 93e5969a275c3..6515301aefd14 100644
--- a/src/libstd/num/f64.rs
+++ b/src/libstd/num/f64.rs
@@ -903,7 +903,7 @@ impl f64 {
     /// let abs_difference_1 = (f.1 - x.cos()).abs();
     ///
     /// assert!(abs_difference_0 < 1e-10);
-    /// assert!(abs_difference_0 < 1e-10);
+    /// assert!(abs_difference_1 < 1e-10);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]