diff --git a/modules/block/block.api.php b/modules/block/block.api.php
index 312eb11..dc24b08 100644
--- a/modules/block/block.api.php
+++ b/modules/block/block.api.php
@@ -205,6 +205,8 @@ function hook_block_save($delta = '', $edit = array()) {
  *     have a default title, this should be set to NULL.
  *   - content: The content of the block's body. This may be a renderable array
  *     (preferable) or a string containing rendered HTML content.
+ *     If The content is empty, the block is not shown at all.
+ *   May be an empty array so as the block is not shown at all.
  *
  * For a detailed usage example, see block_example.module.
  *