diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
index ff80a4e3053..17d412411c0 100644
--- a/src/libstd/num/f32.rs
+++ b/src/libstd/num/f32.rs
@@ -217,7 +217,7 @@ impl f32 {
     /// // Values between `0` and `min` are Subnormal.
     /// assert!(!lower_than_min.is_normal());
     /// ```
-    /// [subnormal]: http://en.wikipedia.org/wiki/Denormal_number
+    /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn is_normal(self) -> bool { num::Float::is_normal(self) }
@@ -923,12 +923,12 @@ impl f32 {
     /// Computes the tangent of a number (in radians).
     ///
     /// ```
-    /// use std::f64;
+    /// use std::f32;
     ///
-    /// let x = f64::consts::PI/4.0;
+    /// let x = f32::consts::PI / 4.0;
     /// let abs_difference = (x.tan() - 1.0).abs();
     ///
-    /// assert!(abs_difference < 1e-10);
+    /// assert!(abs_difference <= f32::EPSILON);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
@@ -1052,12 +1052,14 @@ impl f32 {
     /// number is close to zero.
     ///
     /// ```
-    /// let x = 7.0f64;
+    /// use std::f32;
     ///
-    /// // e^(ln(7)) - 1
-    /// let abs_difference = (x.ln().exp_m1() - 6.0).abs();
+    /// let x = 6.0f32;
     ///
-    /// assert!(abs_difference < 1e-10);
+    /// // e^(ln(6)) - 1
+    /// let abs_difference = (x.ln().exp_m1() - 5.0).abs();
+    ///
+    /// assert!(abs_difference <= 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 b7750317870..70b7706535c 100644
--- a/src/libstd/num/f64.rs
+++ b/src/libstd/num/f64.rs
@@ -147,23 +147,23 @@ impl f64 {
     /// [subnormal][subnormal], or `NaN`.
     ///
     /// ```
-    /// use std::f32;
+    /// use std::f64;
     ///
-    /// let min = f32::MIN_POSITIVE; // 1.17549435e-38f64
-    /// let max = f32::MAX;
-    /// let lower_than_min = 1.0e-40_f32;
-    /// let zero = 0.0f32;
+    /// let min = f64::MIN_POSITIVE; // 2.2250738585072014e-308f64
+    /// let max = f64::MAX;
+    /// let lower_than_min = 1.0e-308_f64;
+    /// let zero = 0.0f64;
     ///
     /// assert!(min.is_normal());
     /// assert!(max.is_normal());
     ///
     /// assert!(!zero.is_normal());
-    /// assert!(!f32::NAN.is_normal());
-    /// assert!(!f32::INFINITY.is_normal());
+    /// assert!(!f64::NAN.is_normal());
+    /// assert!(!f64::INFINITY.is_normal());
     /// // Values between `0` and `min` are Subnormal.
     /// assert!(!lower_than_min.is_normal());
     /// ```
-    /// [subnormal]: http://en.wikipedia.org/wiki/Denormal_number
+    /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn is_normal(self) -> bool { num::Float::is_normal(self) }
@@ -655,9 +655,9 @@ impl f64 {
     /// ```
     /// #![feature(float_extras)]
     ///
-    /// let x = 1.0f32;
+    /// let x = 1.0f64;
     ///
-    /// let abs_diff = (x.next_after(2.0) - 1.00000011920928955078125_f32).abs();
+    /// let abs_diff = (x.next_after(2.0) - 1.0000000000000002220446049250313_f64).abs();
     ///
     /// assert!(abs_diff < 1e-10);
     /// ```
diff --git a/src/libstd/primitive_docs.rs b/src/libstd/primitive_docs.rs
index 11af768c5b9..be9cd6a6888 100644
--- a/src/libstd/primitive_docs.rs
+++ b/src/libstd/primitive_docs.rs
@@ -490,9 +490,6 @@ mod prim_tuple { }
 ///
 /// *[See also the `std::f32` module](f32/index.html).*
 ///
-/// However, please note that examples are shared between the `f64` and `f32`
-/// primitive types. So it's normal if you see usage of `f64` in there.
-///
 mod prim_f32 { }
 
 #[doc(primitive = "f64")]
@@ -501,9 +498,6 @@ mod prim_f32 { }
 ///
 /// *[See also the `std::f64` module](f64/index.html).*
 ///
-/// However, please note that examples are shared between the `f64` and `f32`
-/// primitive types. So it's normal if you see usage of `f32` in there.
-///
 mod prim_f64 { }
 
 #[doc(primitive = "i8")]