diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index 5f22344..5b68870 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -148,6 +148,7 @@ public function form(array $form, FormStateInterface $form_state) {
           '#title' => $this->t('Image styles'),
           '#type' => 'checkboxes',
           '#options' => array_diff_key($image_styles, array('' => '')),
+          '#description' => $this->t('Select image styles with widths that range from the smallest amount of space this image will take up in the layout to the largest, bearing in mind that high resolution screens will need images 1.5x to 2x larger.'),
           '#default_value' => isset($image_style_mapping['image_mapping']['sizes_image_styles']) ? $image_style_mapping['image_mapping']['sizes_image_styles'] : array(),
           '#states' => array(
             'visible' => array(