diff --git a/docs/3-Templates.md b/docs/3-Templates.md
index 63b34c75f..53b26a31b 100644
--- a/docs/3-Templates.md
+++ b/docs/3-Templates.md
@@ -155,6 +155,7 @@ Can be displayed in a template with:
 | `site.allpages`       | Collection of all pages, regardless of their language. |
 | `site.taxonomies`     | Collection of vocabularies.                            |
 | `site.time`           | [_Timestamp_](https://wikipedia.org/wiki/Unix_time) of the last generation. |
+| `site.debug`          | Debug mode: `true` or `false`.                         |
 
 #### site.menus
 
diff --git a/src/Renderer/Site.php b/src/Renderer/Site.php
index 959f6543e..aff7687e6 100644
--- a/src/Renderer/Site.php
+++ b/src/Renderer/Site.php
@@ -51,6 +51,7 @@ public function offsetExists($offset): bool
         switch ($offset) {
             case 'menus':
             case 'home':
+            case 'debug':
                 return true;
         }
 
@@ -83,6 +84,8 @@ public function offsetGet($offset)
                 return new Language($this->config, $this->language);
             case 'home':
                 return 'index';
+            case 'debug':
+                return $this->builder->isDebug();
         }
 
         return $this->config->get($offset, $this->language);