diff --git a/types/leaflet/index.d.ts b/types/leaflet/index.d.ts
index 28edb0ae99..ae8ed8ef40 100644
--- a/types/leaflet/index.d.ts
+++ b/types/leaflet/index.d.ts
@@ -6,6 +6,7 @@
 //                 Roni Karilkar <https://github.com/ronikar>
 //                 Sandra Frischmuth <https://github.com/sanfrisc>
 //                 Vladimir Dashukevich <https://github.com/life777>
+//                 Henry Thasler <https://github.com/henrythasler>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -986,7 +987,7 @@ export class Polyline<T extends geojson.GeometryObject = geojson.LineString | ge
     isEmpty(): boolean;
     getCenter(): LatLng;
     getBounds(): LatLngBounds;
-    addLatLng(latlng: LatLngExpression | LatLngExpression[]): this;
+    addLatLng(latlng: LatLngExpression | LatLngExpression[], latlngs?: LatLng[]): this;
     closestLayerPoint(p: Point): Point;
 
     feature?: geojson.Feature<T, P>;
diff --git a/types/leaflet/leaflet-tests.ts b/types/leaflet/leaflet-tests.ts
index f946ca9ac2..e6350ab417 100644
--- a/types/leaflet/leaflet-tests.ts
+++ b/types/leaflet/leaflet-tests.ts
@@ -592,6 +592,7 @@ const simplePolylineLatLngs: L.LatLngExpression[] = [[45.51, -122.68], [37.77, -
 polyline = L.polyline(simplePolylineLatLngs);
 polyline = new L.Polyline(simplePolylineLatLngs);
 polyline.setLatLngs(simplePolylineLatLngs);
+polyline.addLatLng([45.51, -122.68]);
 const simplePolylineLatLngs2: L.LatLng[] = polyline.getLatLngs() as L.LatLng[];
 
 // multi polyline
@@ -602,6 +603,8 @@ const multiPolylineLatLngs: L.LatLngExpression[][] = [
 polyline = L.polyline(multiPolylineLatLngs);
 polyline = new L.Polyline(multiPolylineLatLngs);
 polyline.setLatLngs(multiPolylineLatLngs);
+const segment = polyline.getLatLngs() as L.LatLng[][];
+polyline.addLatLng([40.78, -73.91], segment[1]);
 const multiPolylineLatLngs2: L.LatLng[][] = polyline.getLatLngs() as L.LatLng[][];
 
 const obj1 = {