diff --git a/content/draft6/validation/dependencies.markdown b/content/draft6/validation/dependencies.markdown
index 41fddd7..cda3d7b 100644
--- a/content/draft6/validation/dependencies.markdown
+++ b/content/draft6/validation/dependencies.markdown
@@ -13,6 +13,8 @@ index: -3
 tests:
   - draft6/dependencies.json
 introduced_in: draft3
+changed_in:
+  - 2019-09
 related:
   - vocabulary: validation
     keyword: required
diff --git a/content/draft6/validation/items.markdown b/content/draft6/validation/items.markdown
index e4505a9..33d7d0c 100644
--- a/content/draft6/validation/items.markdown
+++ b/content/draft6/validation/items.markdown
@@ -12,6 +12,8 @@ default:
 tests:
   - draft6/items.json
 introduced_in: draft1
+changed_in:
+  - 2020-12
 index: -99
 interdependencies:
   - vocabulary: validation