diff --git a/src/Card.js b/src/Card.js
index de80646..68ab8c8 100644
--- a/src/Card.js
+++ b/src/Card.js
@@ -34,6 +34,7 @@ const computeDirection = (fromX, fromY, allowedDirections) => {
 /**
  * @param {Stack} stack
  * @param {HTMLElement} targetElement
+ * @param {boolean} prepend
  * @returns {Object} An instance of Card.
  */
 const Card = (stack, targetElement, prepend) => {
diff --git a/src/Stack.js b/src/Stack.js
index d9bbd60..2185cdf 100644
--- a/src/Stack.js
+++ b/src/Stack.js
@@ -55,6 +55,7 @@ const Stack = (config) => {
    * Creates an instance of Card and associates it with an element.
    *
    * @param {HTMLElement} element
+   * @param {boolean} prepend
    * @returns {Card}
    */
   stack.createCard = (element, prepend) => {