diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index 38b3fab6d7535..913c0f96d118d 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -26,7 +26,7 @@ pub const DIGITS: u32 = 6;
 
 /// [Machine epsilon] value for `f32`.
 ///
-/// This is the difference between `1.0` and the next largest representable number.
+/// This is the difference between `1.0` and the next larger representable number.
 ///
 /// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index f093bae9590ea..6ca830b1f38af 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -26,7 +26,7 @@ pub const DIGITS: u32 = 15;
 
 /// [Machine epsilon] value for `f64`.
 ///
-/// This is the difference between `1.0` and the next largest representable number.
+/// This is the difference between `1.0` and the next larger representable number.
 ///
 /// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
 #[stable(feature = "rust1", since = "1.0.0")]