diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index 27eee09..cad19fe 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -115,12 +115,11 @@ public function form(array $form, FormStateInterface $form_state) {
           '#title' => $this->t('Type'),
           '#type' => 'radios',
           '#options' => array(
-            'sizes' => $this->t('Select mutiple image styles and use the sizes attribute'),
+            'sizes' => $this->t('Select mutiple image styles and use the <a href="@sizes_help">sizes attribute</a>.', array('@sizes_help' => 'https://www.drupal.org/documentation/modules/responsive_image')),
             'image_style' => $this->t('Select a single image style'),
             '_none' => $this->t('Do not use this breakpoint'),
           ),
           '#default_value' => isset($image_style_mapping['image_mapping_type']) ? $image_style_mapping['image_mapping_type'] : '_none',
-          '#description' => $this->t('Learn more about the <a href="@sizes_help">sizes attribute</a>.', array('@sizes_help' => \Drupal::url('help.page', array('name' => 'responsive_image')))),
         );
         $form['keyed_styles'][$breakpoint_id][$multiplier]['image_style'] = array(
           '#type' => 'select',
@@ -138,7 +137,7 @@ public function form(array $form, FormStateInterface $form_state) {
           '#type' => 'textfield',
           '#title' => $this->t('Sizes'),
           '#default_value' => isset($image_style_mapping['image_mapping']['sizes']) ? $image_style_mapping['image_mapping']['sizes'] : '',
-          '#description' => $this->t('Enter the value for the sizes attribute: for example "(min-width:700px) 700px, 100vw)".'),
+          '#description' => $this->t('Enter the value for the <a href="@sizes_help">sizes attribute</a>: for example "(min-width:700px) 700px, 100vw)".', array('@sizes_help' => 'https://www.drupal.org/documentation/modules/responsive_image')),
           '#states' => array(
             'visible' => array(
               ':input[name="keyed_styles[' . $breakpoint_id . '][' . $multiplier . '][image_mapping_type]"]' => array('value' => 'sizes'),