diff --git a/src/geometry/rotation_construction.rs b/src/geometry/rotation_construction.rs
index 98d0677f..1fc033e4 100644
--- a/src/geometry/rotation_construction.rs
+++ b/src/geometry/rotation_construction.rs
@@ -16,14 +16,15 @@ where
     /// # Example
     /// ```
     /// # use nalgebra::{Rotation2, Rotation3};
+    /// # use nalgebra::Vector3;
     /// let rot1 = Rotation2::identity();
-    /// let rot2 = Rotation2::new(f32::consts::FRAC_PI_2);
+    /// let rot2 = Rotation2::new(std::f32::consts::FRAC_PI_2);
     ///
     /// assert_eq!(rot1 * rot2, rot2);
     /// assert_eq!(rot2 * rot1, rot2);
     ///
     /// let rot1 = Rotation3::identity();
-    /// let rot2 = Rotation3::from_axis_angle(&Vector3::z_axis(), f32::consts::FRAC_PI_2);
+    /// let rot2 = Rotation3::from_axis_angle(&Vector3::z_axis(), std::f32::consts::FRAC_PI_2);
     ///
     /// assert_eq!(rot1 * rot2, rot2);
     /// assert_eq!(rot2 * rot1, rot2);