diff --git a/core/blockly.js b/core/blockly.js
index b900cd41a..427d45199 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -202,6 +202,9 @@ Blockly.onKeyDown_ = function(e) {
     }
     if (Blockly.selected &&
         Blockly.selected.isDeletable() && Blockly.selected.isMovable()) {
+      // Don't allow copying immovable or undeletable blocks. The next step
+      // would be to paste, which would create additional undeletable/immovable
+      // blocks on the workspace.
       if (e.keyCode == 67) {
         // 'c' for copy.
         Blockly.hideChaff();
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index 5766c3de8..37ab8b910 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -274,6 +274,7 @@ Blockly.WorkspaceSvg.prototype.toolboxCategoryCallbacks_ = {};
  * @package
  */
 Blockly.WorkspaceSvg.prototype.targetWorkspace = null;
+
 /**
  * Inverted screen CTM, for use in mouseToSvg.
  * @type {SVGMatrix}