diff --git a/_dev/js/theme/core/checkout/components/useCheckoutStepsController.js b/_dev/js/theme/core/checkout/components/useCheckoutStepsController.js
index 5d5271ad..20eaea41 100644
--- a/_dev/js/theme/core/checkout/components/useCheckoutStepsController.js
+++ b/_dev/js/theme/core/checkout/components/useCheckoutStepsController.js
@@ -1,7 +1,13 @@
 import prestashop from 'prestashop';
-
 import { getAllSiblingsBeforeElement, getAllSiblingsAfterElement } from '../../../utils/DOMSelectorsHelper';
 
+/**
+ * A utility function to control checkout steps in Prestashop.
+ *
+ * @module useCheckoutStepsController
+ * @param {string} stepsSelector - The selector for identifying checkout steps. Defaults to Prestashop's default selector.
+ * @returns {object} An object with functions for controlling checkout steps.
+ */
 const useCheckoutStepsController = (stepsSelector = prestashop.selectors.checkout.step) => {
   const DOMClasses = {
     STEP_CURRENT: '-current',
@@ -11,19 +17,58 @@ const useCheckoutStepsController = (stepsSelector = prestashop.selectors.checkou
     STEP_UNREACHABLE: '-unreachable',
   };
 
+  /**
+   * Checks if a step is the current step.
+   *
+   * @function
+   * @param {HTMLElement} step - The step element to check.
+   * @returns {boolean} True if the step is the current step, false otherwise.
+   */
   const isStepCurrent = (step) => step.classList.contains(DOMClasses.STEP_CURRENT);
 
+  /**
+   * Checks if a step is unreachable.
+   *
+   * @function
+   * @param {HTMLElement} step - The step element to check.
+   * @returns {boolean} True if the step is unreachable, false otherwise.
+   */
   const isStepUnreachable = (step) => step.classList.contains(DOMClasses.STEP_UNREACHABLE);
 
+  /**
+   * Checks if a step has a continue button.
+   *
+   * @function
+   * @param {HTMLElement} step - The step element to check.
+   * @returns {boolean} True if the step has a continue button, false otherwise.
+   */
   const hasStepContinueButton = (step) => step.querySelector('button.continue') !== null;
 
+  /**
+   * Gets the current step.
+   *
+   * @function
+   * @returns {HTMLElement|null} The current step element, or null if not found.
+   */
   const getCurrentStep = () => document.querySelector(`${stepsSelector}.${DOMClasses.STEP_CURRENT}`);
 
+  /**
+   * Sets a step as the current step.
+   *
+   * @function
+   * @param {HTMLElement} step - The step element to set as current.
+   */
   const setCurrentStep = (step) => {
     getCurrentStep()?.classList.remove(DOMClasses.STEP_CURRENT);
     step.classList.add(DOMClasses.STEP_CURRENT);
   };
 
+  /**
+   * Disables all steps after the provided step.
+   *
+   * @function
+   * @param {HTMLElement} step - The step after which all steps should be disabled.
+   */
   const disableAllAfter = (step) => {
     const nextSteps = getAllSiblingsAfterElement(step);
 
@@ -34,6 +79,12 @@ const useCheckoutStepsController = (stepsSelector = prestashop.selectors.checkou
     }
   };
 
+  /**
+   * Enables all steps before the provided step.
+   *
+   * @function
+   * @param {HTMLElement} step - The step before which all steps should be enabled.
+   */
   const enableAllBefore = (step) => {
     const prevSteps = getAllSiblingsBeforeElement(step);
 
@@ -44,6 +95,12 @@ const useCheckoutStepsController = (stepsSelector = prestashop.selectors.checkou
     }
   };
 
+  /**
+   * Changes the current step and adjusts the reachable and unreachable steps accordingly.
+   *
+   * @function
+   * @param {HTMLElement} step - The step to change to.
+   */
   const changeStep = (step) => {
     if (!step) {
       return;
diff --git a/_dev/js/theme/core/checkout/handler/address/changeAddressHandler.js b/_dev/js/theme/core/checkout/handler/address/changeAddressHandler.js
index 5222cda4..d634dd2b 100644
--- a/_dev/js/theme/core/checkout/handler/address/changeAddressHandler.js
+++ b/_dev/js/theme/core/checkout/handler/address/changeAddressHandler.js
@@ -6,8 +6,10 @@ import switchConfirmAddressesButtonState from '../../utils/switchConfirmAddresse
 import { isElementVisible, each } from '../../../../utils/DOMHelpers';
 
 /**
- * Change address handler
- * @param event {object} - change event
+ * Handles the change event for address selection in the Prestashop checkout process.
+ *
+ * @function
+ * @param {object} event - The change event object.
  */
 const changeAddressHandler = (event) => {
   const {