diff --git a/framework/UPGRADE.md b/framework/UPGRADE.md
index 7ec63dc..0a1a8c0 100644
--- a/framework/UPGRADE.md
+++ b/framework/UPGRADE.md
@@ -65,6 +65,8 @@ Upgrade from Yii 2.0.42
   ```sql
   INSERT INTO `some_table` (`int_unsigned_col`) VALUES (22)
   ```
+* Property `yii\db\ColumnSchemaBuilder::$categoryMap` has been removed in favor of getter/setter methods `getCategoryMap()` 
+  and `setCategoryMap()`.
 
 Upgrade from Yii 2.0.41
 -----------------------