core/modules/block/lib/Drupal/block/BlockBase.php |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/modules/block/lib/Drupal/block/BlockBase.php b/core/modules/block/lib/Drupal/block/BlockBase.php
index 17ce717..59ea159 100644
--- a/core/modules/block/lib/Drupal/block/BlockBase.php
+++ b/core/modules/block/lib/Drupal/block/BlockBase.php
@@ -114,6 +114,7 @@ public function buildConfigurationForm(array $form, array &$form_state) {
     $form['cache']['max_age'] = array(
       '#type' => 'select',
       '#title' => t('Cache: Max age'),
+      '#description' => t('Choose how long this block may be cached. The default of 0 seconds means it will never be cached.'),
       '#default_value' => $this->configuration['cache']['max_age'],
       '#options' => drupal_map_assoc(array(0, 60, 300, 1800, 3600, 21600, 86400, 604800, 2592000, 31536000, 315360000), 'format_interval'),
     );
@@ -233,7 +234,7 @@ public function isCacheable() {
     // Similar to the page cache, a block is cacheable if it has a max age.
     // Blocks that should never be cached can override this method to simply
     // return FALSE.
-    return (int)$this->configuration['cache']['max_age'] > 0;
+    return (bool)$this->configuration['cache']['max_age'] > 0;
   }
 
 }