diff --git a/packages/website/docs/Api/DistPointSet.md b/packages/website/docs/Api/DistPointSet.md
index 9c9c3d0d..a966f296 100644
--- a/packages/website/docs/Api/DistPointSet.md
+++ b/packages/website/docs/Api/DistPointSet.md
@@ -46,3 +46,13 @@ PointSet.makeDiscrete([
   { x: 3, y: 0.1 },
 ]);
 ```
+
+### mapY
+
+```
+PointSet.mapY: (pointSetDist, (number => number)) => pointSetDist
+```
+
+```javascript
+normal(5,3) |> PointSet.fromDist |> PointSet.mapY({|x| x ^ 2}) |> normalize
+```
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