diff --git a/src/noise/noise.rs b/src/noise/noise.rs
index 1fb9c35..f6ec73d 100644
--- a/src/noise/noise.rs
+++ b/src/noise/noise.rs
@@ -15,5 +15,8 @@
 
 //! Procedural noise generation utility types
 
+pub use self::perlin::Perlin;
+pub use self::simplex::Simplex;
+
 pub mod perlin;
 pub mod simplex;
diff --git a/src/noise/perlin.rs b/src/noise/perlin.rs
index 36a588b..6f26a41 100644
--- a/src/noise/perlin.rs
+++ b/src/noise/perlin.rs
@@ -13,4 +13,24 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// TODO
+use geom::{Point2, Point3};
+
+pub struct Perlin<T>;
+
+impl<T> Perlin<T> {
+    pub fn new() -> Perlin<T> {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise1(&self, _x: T) -> T {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise2(&self, _pos: Point2<T>) -> T {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise3(&self, _pos: Point3<T>) -> T {
+        fail!("Not yet implemented!")
+    }
+}
diff --git a/src/noise/simplex.rs b/src/noise/simplex.rs
index 36a588b..3aea7bc 100644
--- a/src/noise/simplex.rs
+++ b/src/noise/simplex.rs
@@ -13,4 +13,25 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// TODO
+use core::Vec4;
+use geom::{Point2, Point3};
+
+pub struct Simplex<T>;
+
+impl<T> Simplex<T> {
+    pub fn new() -> Simplex<T> {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise2(&self, _pos: Point2<T>) -> T {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise3(&self, _pos: Point3<T>) -> T {
+        fail!("Not yet implemented!")
+    }
+
+    pub fn noise4(&self, _vec: Vec4<T>) -> T {
+        fail!("Not yet implemented!")
+    }
+}