diff --git a/src/layer/GeoJSON.js b/src/layer/GeoJSON.js
index 017ae27fc87..8d3f7830691 100644
--- a/src/layer/GeoJSON.js
+++ b/src/layer/GeoJSON.js
@@ -298,19 +298,25 @@ var PointToGeoJSON = {
 };
 
 // @namespace Marker
-// @method toGeoJSON(): Object
+// @method toGeoJSON(precision?: Number): Object
+// `precision` is the number of decimal places for coordinates.
+// The default value is 6 places.
 // Returns a [`GeoJSON`](http://en.wikipedia.org/wiki/GeoJSON) representation of the marker (as a GeoJSON `Point` Feature).
 Marker.include(PointToGeoJSON);
 
 // @namespace CircleMarker
-// @method toGeoJSON(): Object
+// @method toGeoJSON(precision?: Number): Object
+// `precision` is the number of decimal places for coordinates.
+// The default value is 6 places.
 // Returns a [`GeoJSON`](http://en.wikipedia.org/wiki/GeoJSON) representation of the circle marker (as a GeoJSON `Point` Feature).
 Circle.include(PointToGeoJSON);
 CircleMarker.include(PointToGeoJSON);
 
 
 // @namespace Polyline
-// @method toGeoJSON(): Object
+// @method toGeoJSON(precision?: Number): Object
+// `precision` is the number of decimal places for coordinates.
+// The default value is 6 places.
 // Returns a [`GeoJSON`](http://en.wikipedia.org/wiki/GeoJSON) representation of the polyline (as a GeoJSON `LineString` or `MultiLineString` Feature).
 Polyline.include({
 	toGeoJSON: function (precision) {
@@ -326,7 +332,9 @@ Polyline.include({
 });
 
 // @namespace Polygon
-// @method toGeoJSON(): Object
+// @method toGeoJSON(precision?: Number): Object
+// `precision` is the number of decimal places for coordinates.
+// The default value is 6 places.
 // Returns a [`GeoJSON`](http://en.wikipedia.org/wiki/GeoJSON) representation of the polygon (as a GeoJSON `Polygon` or `MultiPolygon` Feature).
 Polygon.include({
 	toGeoJSON: function (precision) {
@@ -362,7 +370,9 @@ LayerGroup.include({
 		});
 	},
 
-	// @method toGeoJSON(): Object
+	// @method toGeoJSON(precision?: Number): Object
+	// `precision` is the number of decimal places for coordinates.
+	// The default value is 6 places.
 	// Returns a [`GeoJSON`](http://en.wikipedia.org/wiki/GeoJSON) representation of the layer group (as a GeoJSON `FeatureCollection`, `GeometryCollection`, or `MultiPoint`).
 	toGeoJSON: function (precision) {