diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/field/Boolean.php b/core/modules/views/lib/Drupal/views/Plugin/views/field/Boolean.php
index 5a9ae65..40be2d2 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/field/Boolean.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/field/Boolean.php
@@ -35,6 +35,8 @@ class Boolean extends FieldPluginBase {
   protected function defineOptions() {
     $options = parent::defineOptions();
     $options['type'] = array('default' => 'yes-no');
+    $options['type_custom_true'] = array('default' => '', 'translatable' => TRUE);
+    $options['type_custom_false'] = array('default' => '', 'translatable' => TRUE);
     $options['not'] = array('definition bool' => 'reverse');
 
     return $options;
@@ -52,7 +54,8 @@ public function init(ViewExecutable $view, &$options) {
       'unicode-yes-no' => array('✔', '✖'),
     );
     $output_formats = isset($this->definition['output formats']) ? $this->definition['output formats'] : array();
-    $this->formats = array_merge($default_formats, $output_formats);
+    $custom_format = array('custom' => array(t('Custom')));
+    $this->formats = array_merge($default_formats, $output_formats, $custom_format);
   }
 
   public function buildOptionsForm(&$form, &$form_state) {
@@ -66,6 +69,26 @@ public function buildOptionsForm(&$form, &$form_state) {
       '#options' => $options,
       '#default_value' => $this->options['type'],
     );
+    $form['type_custom_true'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Custom output for TRUE'),
+      '#default_value' => $this->options['type_custom_true'],
+      '#states' => array(
+        'visible' => array(
+          'select[name="options[type]"]' => array('value' => 'custom'),
+        ),
+      ),
+    );
+    $form['type_custom_false'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Custom output for FALSE'),
+      '#default_value' => $this->options['type_custom_false'],
+      '#states' => array(
+        'visible' => array(
+          'select[name="options[type]"]' => array('value' => 'custom'),
+        ),
+      ),
+    );
     $form['not'] = array(
       '#type' => 'checkbox',
       '#title' => t('Reverse'),
@@ -81,7 +104,10 @@ function render($values) {
       $value = !$value;
     }
 
-    if (isset($this->formats[$this->options['type']])) {
+    if ($this->options['type'] == 'custom') {
+      return $value ? check_plain($this->options['type_custom_true']) : check_plain($this->options['type_custom_false']);
+    }
+    elseif (isset($this->formats[$this->options['type']])) {
       return $value ? $this->formats[$this->options['type']][0] : $this->formats[$this->options['type']][1];
     }
     else {