diff --git a/README.md b/README.md
index 4b4941d..2d53566 100644
--- a/README.md
+++ b/README.md
@@ -85,3 +85,4 @@ An object that contains the data for a single feature.
 - **loadGeometry()** — parses feature geometry and returns an array of
   [Point](https://github.com/mapbox/point-geometry) arrays (with each point having `x` and `y` properties)
 - **bbox()** — calculates and returns the bounding box of the feature in the form `[x1, y1, x2, y2]`
+- **toGeoJSON(x, y, z)** — returns a GeoJSON representation of the feature. (`x`, `y`, and `z` refer to the containing tile's index.)