diff --git a/modules/block/block.module b/modules/block/block.module
index b6a7332..bcbbeb8 100644
--- a/modules/block/block.module
+++ b/modules/block/block.module
@@ -692,6 +692,9 @@ function block_list($region) {
 /**
  * Loads a block object from the database.
  *
+ * This function returns the first block matching module and delta parameters,
+ * it should not be used for a theme-specific functionality.
+ *
  * @param $module
  *   Name of the module that implements the block to load.
  * @param $delta