diff --git a/changelog.md b/changelog.md
index d1a9869..237379d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -21,3 +21,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - ROUGE metric (ROUGE-1, ROUGE-2, ROUGE-L with precision/recall/F-measure)
 - Flesch-Kincaid readability metrics (grade level and reading ease)
 - Batch scoring with aggregate statistics for all metrics
+- Validators module with `Check` protocol for validation checks
+- Metric-based validators: `BleuValidator`, `RougeValidator`, `LexicalValidator`
+- Constraint validators: `LengthValidator`, `ReadabilityValidator`, `ContainsValidator`, `ExcludesValidator`
+- Composite validators: `AllOf` (all checks must pass), `AnyOf` (any check must pass)
+- Factory functions for clean validator API (`bleu()`, `rouge()`, `lexical()`, `length()`, `readability()`, `contains()`, `excludes()`, `all_of()`, `any_of()`)