Update README

README.md

@@ -5,12 +5,26 @@ A linear algebra and mathematics library for computer graphics.
 The library provides:
 
 - vectors: `Vec2`, `Vec3`, `Vec4`
-- points: `Point2`, `Point3`, `Point4`
-- square matricies: `Mat2`, `Mat3`, `Mat4`
+- square matrices: `Mat2`, `Mat3`, `Mat4`
 - a quaternion type: `Quat`
-- perspective projections
+- rotation matrices: `Rot2`, `Rot3`
+- rotations: `Euler`, `AxisAngle`
+- angle units: `Rad`, `Deg`
+- points: `Point2`, `Point3`, `Point4`
+- rays: `Ray2`, `Ray3`
+- plane: `Plane`
+- perspective projections: `Perspective`, `PerspectiveFov`, `Ortho`
+- a view frustum: `Frustrum`,
+- axis-aligned bounding boxes: `Aabb2`, `Aabb3`
+- oriented bounding boxes: `Obb2`, `Obb3`
+- collision primitives: `Sphere`, `Cylinder`
 - and more to come...?
 
+Not all of the functionality has been implemented yet, and the existing code
+is not fully covered by the testsuite. If you encounter any mistakes or
+omissions please let me know by posting an issue, or even better: send me a
+pull request with a fix.
+
 ## Compilation
 
 ~~~
@@ -24,7 +38,7 @@ applications rather than general linear algebra. It only offers the 2, 3, and
 4 dimensional structures that are more than useful for most computer graphics
 applications. This design decision was made in order to simplify the
 implementation (Rust cannot paramerise over constants at compile time), and to
-make graphics-specific optimisations easier in the future. Those looking for
+make dimension-specific optimisations easier in the future. Those looking for
 n-dimensional mathematics can look to [nalgebra](https://github.com/sebcrozet/nalgebra).
 
 Currently, operators are not overloaded. This is due to limitations in Rust's
@@ -35,4 +49,4 @@ generics that will be fixed sometime in the future.
 Pull requests are most welcome, especially in the realm of performance
 enhancements and fixing any mistakes I may have made along the way. Unit tests
 and benchmarks are also required, so help on that front would be most
-appreaciated.
+appreciated.