diff --git a/src/main/java/com/ossez/codebank/interview/KayakCountUpDown.java b/src/main/java/com/ossez/codebank/interview/KayakCountUpDown.java
index 8b696881a3..fa272b22a1 100644
--- a/src/main/java/com/ossez/codebank/interview/KayakCountUpDown.java
+++ b/src/main/java/com/ossez/codebank/interview/KayakCountUpDown.java
@@ -3,19 +3,32 @@ package com.ossez.codebank.interview;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
+ * 
+ * https://www.cwiki.us/display/ITCLASSIFICATION/Count+Up+Down
  * 
  * @author YuCheng
  *
  */
 public class KayakCountUpDown {
+	private final static Logger logger = LoggerFactory.getLogger(KayakCountUpDown.class);
 
 	static int minNumber = 0;
 	static int maxNumber = 0;
 	int tmpN = 0;
 	List<Integer> retList = new ArrayList<Integer>();
 
+	/**
+	 * 
+	 * @param start
+	 * @param end
+	 * @return
+	 */
 	public List<Integer> countUp(int start, int end) {
+		logger.debug("BEGIN");
 		maxNumber = end;
 		tmpN = start;
 		moveUp(0);
@@ -24,19 +37,30 @@ public class KayakCountUpDown {
 
 	}
 
+	/**
+	 * 
+	 * @param start
+	 * @param end
+	 * @return
+	 */
 	public List<Integer> countUpDown(int start, int end) {
+		logger.debug("BEGIN");
 		minNumber = start;
 		maxNumber = end;
 		tmpN = start;
-		
+
 		moveUp(0);
 		retList.add(end);
-		
+
 		moveDown(1);
 		return retList;
-	
+
 	}
 
+	/**
+	 * 
+	 * @param n
+	 */
 	private void moveUp(int n) {
 		retList.add(tmpN);
 		tmpN++;
@@ -46,8 +70,12 @@ public class KayakCountUpDown {
 
 	}
 
+	/**
+	 * 
+	 * @param n
+	 */
 	private void moveDown(int n) {
-		tmpN = (maxNumber - n );
+		tmpN = (maxNumber - n);
 		retList.add(tmpN);
 
 		if (tmpN != minNumber) {