diff --git a/library/src/com/twotoasters/clusterkraf/Clusterkraf.java b/library/src/com/twotoasters/clusterkraf/Clusterkraf.java
index 3e7fc3c..2ec05da 100644
--- a/library/src/com/twotoasters/clusterkraf/Clusterkraf.java
+++ b/library/src/com/twotoasters/clusterkraf/Clusterkraf.java
@@ -2,14 +2,15 @@
 
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 
 import android.annotation.SuppressLint;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Handler;
-
 import android.view.View;
+
 import com.google.android.gms.maps.CameraUpdate;
 import com.google.android.gms.maps.CameraUpdateFactory;
 import com.google.android.gms.maps.GoogleMap;
@@ -49,7 +50,7 @@ public class Clusterkraf {
 	 * @param options
 	 *            Customized options
 	 */
-	public Clusterkraf(GoogleMap map, Options options, ArrayList<InputPoint> points) {
+	public Clusterkraf(GoogleMap map, Options options, Collection<InputPoint> points) {
 		this.mapRef = new WeakReference<GoogleMap>(map);
 		this.options = options;
 		this.innerCallbackListener = new InnerCallbackListener(this);
@@ -89,7 +90,7 @@ public void add(InputPoint inputPoint) {
 	 * @param inputPoints
 	 *            The list of InputPoint objects for clustering
 	 */
-	public void addAll(ArrayList<InputPoint> inputPoints) {
+	public void addAll(Collection<InputPoint> inputPoints) {
 		if (inputPoints != null) {
 			points.addAll(inputPoints);
 			updateClustersAndTransition();