diff --git a/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
index 41e5b79..9f0f016 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
@@ -41,6 +41,9 @@ protected function initMink() {
    *   The CSS selector identifying the element to check.
    * @param string $message
    *   Optional message to show alongside the assertion.
+   *
+   * @deprecated in Drupal 8.1.x, will be removed before Drupal 8.3.x. Use
+   *   \Behat\Mink\Element\NodeElement::isVisible() instead.
    */
   protected function assertElementVisible($css_selector, $message = '') {
     $this->assertTrue($this->getSession()->getDriver()->isVisible(CssSelector::toXPath($css_selector)), $message);
@@ -53,6 +56,9 @@ protected function assertElementVisible($css_selector, $message = '') {
    *   The CSS selector identifying the element to check.
    * @param string $message
    *   Optional message to show alongside the assertion.
+   *
+   * @deprecated in Drupal 8.1.x, will be removed before Drupal 8.3.x. Use
+   *   \Behat\Mink\Element\NodeElement::isVisible() instead.
    */
   protected function assertElementNotVisible($css_selector, $message = '') {
     $this->assertFalse($this->getSession()->getDriver()->isVisible(CssSelector::toXPath($css_selector)), $message);