diff --git a/src/List.java b/src/List.java
index a43b07b..30f87e4 100644
--- a/src/List.java
+++ b/src/List.java
@@ -24,7 +24,7 @@
 	private Node root;
 
 	/**
-	 * Add an element at a specific position starting at 0.
+	 * Add an element of any position. Negative means adding it to the end.
 	 */
 	@Override
 	public void addAt(int pos, T elem) {
@@ -32,14 +32,23 @@
 			root = new Node(elem);
 		} else if (pos == 0) {
 			root = new Node(elem, root);
-		} else if (pos > 0) {
+		} else {
 			Node walker = root;
 			Node prev = null;
 
-			while (walker != null && pos > 0) {
-				pos--;
-				prev = walker;
-				walker = walker.next;
+			// If position is -1, then loop until the end of the list.
+			if (pos == -1) {
+				while (walker != null) {
+					prev = walker;
+					walker = walker.next;
+				}
+			// If pos is above 0, loop until it's done.
+			} else if (pos > 0) {
+				while (walker != null && (pos > 0)) {
+					pos--;
+					prev = walker;
+					walker = walker.next;
+				}
 			}
 
 			walker = new Node(elem, walker);
@@ -145,7 +154,7 @@
 
 		Node walker = root;
 		for (int i = 0; i < size; ++i) {
-			list[i] = (String)walker.item;
+			list[i] = (String) walker.item;
 			walker = walker.next;
 		}