diff --git a/core/modules/text/src/Plugin/Field/FieldFormatter/TextTrimmedFormatter.php b/core/modules/text/src/Plugin/Field/FieldFormatter/TextTrimmedFormatter.php
index 105bfd5068b0c93aa493a15ba3f3aa53e4a036c6..61fd119dec29aeb23d993ccc3e845650a80a547a 100644
--- a/core/modules/text/src/Plugin/Field/FieldFormatter/TextTrimmedFormatter.php
+++ b/core/modules/text/src/Plugin/Field/FieldFormatter/TextTrimmedFormatter.php
@@ -47,9 +47,11 @@ public static function defaultSettings() {
    */
   public function settingsForm(array $form, FormStateInterface $form_state) {
     $element['trim_length'] = array(
-      '#title' => t('Trim length'),
+      '#title' => t('Trimmed limit'),
       '#type' => 'number',
+      '#field_suffix' => t('characters'),
       '#default_value' => $this->getSetting('trim_length'),
+      '#description' => t('If the summary is not set, the trimmed %label field will end at the last full sentence before this character limit.', array('%label' => $this->fieldDefinition->getLabel())),
       '#min' => 1,
       '#required' => TRUE,
     );
@@ -61,7 +63,7 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
    */
   public function settingsSummary() {
     $summary = array();
-    $summary[] = t('Trim length: @trim_length', array('@trim_length' => $this->getSetting('trim_length')));
+    $summary[] = t('Trimmed limit: @trim_length characters', array('@trim_length' => $this->getSetting('trim_length')));
     return $summary;
   }