diff --git a/core/blockly.js b/core/blockly.js
index 7cd0e449d..54c8a5d24 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -27,7 +27,7 @@
 /**
  * The top level namespace used to access the Blockly library.
  * @namespace Blockly
- */
+ **/
 goog.provide('Blockly');
 
 goog.require('Blockly.BlockSvg.render');
diff --git a/core/blocks.js b/core/blocks.js
index 66ea2257a..5b78050aa 100644
--- a/core/blocks.js
+++ b/core/blocks.js
@@ -27,6 +27,11 @@
 /**
  * A mapping of block type names to block prototype objects.
  * @name Blockly.Blocks
- * @type {!Object<string,Object>}
  */
 goog.provide('Blockly.Blocks');
+
+/*
+ * A mapping of block type names to block prototype objects.
+ * @type {!Object<string,Object>}
+ */
+Blockly.Blocks = new Object(null);