diff --git a/blocks/colour.js b/blocks/colour.js
index b0eb506f7..737fe9466 100644
--- a/blocks/colour.js
+++ b/blocks/colour.js
@@ -30,7 +30,7 @@
 'use strict';
 
 goog.provide('Blockly.Blocks.colour');  // Deprecated
-goog.provide('Blockly.Constants.Colour');
+goog.provide('Blockly.Constants.Colour');  // deprecated, 2018 April 5
 
 goog.require('Blockly.Blocks');
 goog.require('Blockly');
diff --git a/blocks/lists.js b/blocks/lists.js
index c401a99ad..45f596ddc 100644
--- a/blocks/lists.js
+++ b/blocks/lists.js
@@ -30,7 +30,7 @@
 'use strict';
 
 goog.provide('Blockly.Blocks.lists');  // Deprecated
-goog.provide('Blockly.Constants.Lists');
+goog.provide('Blockly.Constants.Lists');  // deprecated, 2018 April 5
 
 goog.require('Blockly.Blocks');
 goog.require('Blockly');