diff --git a/src/org/ntlab/animations/MagnetRONAnimation.java b/src/org/ntlab/animations/MagnetRONAnimation.java
index 42379dd..f73128c 100644
--- a/src/org/ntlab/animations/MagnetRONAnimation.java
+++ b/src/org/ntlab/animations/MagnetRONAnimation.java
@@ -179,7 +179,7 @@
 		STOPPED
 	}
 
-//	private static int animationCount = 0;
+	private static int animationCount = 0;
 	
 	/**
 	 * The constructor of {@code MagnetRONAnimation}.
@@ -364,16 +364,16 @@
 								updateCurrentCycle(getCurrentCycleCount());
 								jumpTo(getCurrentCycleCount());
 							} else if(Math.abs(getCurrentCycleCount()) >= Math.abs(getTotalCycleCount())){
-//								animationCount = 0;
-//								System.out.println(TAG + ": animationCount=" + animationCount);
+								animationCount = 0;
+								System.out.println(TAG + ": animationCount=" + animationCount);
 								onFinished();
 							}
 						}
 					}, getInitialDelay(), getDelay(), TimeUnit.MILLISECONDS);
 					setScheduledFuture(scheduledFuture);
 					setCurrentStatus(Status.RUNNING);
-//					animationCount = 1;
-//					System.out.println(TAG + ": animationCount=" + animationCount);
+					animationCount = 1;
+					System.out.println(TAG + ": animationCount=" + animationCount);
 				};
 				break;
 			case PAUSED:
@@ -388,22 +388,28 @@
 		};
 	}
 	
-//	public static void waitAnimationEnd() {
-//		while (animationCount > 0) {
-//			try {
-//				Thread.sleep(1L);
-//			} catch (InterruptedException e) {
-//				e.printStackTrace();
-//			}
-//		}
-//		// Buffer for another waiting animation. 
-//		try {
-//			Thread.sleep(30L);
-//		} catch (InterruptedException e) {
-//			e.printStackTrace();
-//		}
-//	}
+	/**
+	 * Sleep main thread and wait for {@link MagnetRONAnimation#play()} to finish running.
+	 */
+	public static void waitAnimationEnd() {
+		while (animationCount > 0) {
+			try {
+				Thread.sleep(1L);
+			} catch (InterruptedException e) {
+				e.printStackTrace();
+			}
+		}
+		// Buffer for another waiting animation. 
+		try {
+			Thread.sleep(30L);
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+	}
 	
+	/**
+	 * Play animation in sync with main thread.
+	 */
 	public void syncPlay() {
 		if (getCurrentStatus() == Status.STOPPED) {
 			try {