diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fe5d9d1..20228cc2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # CHANGELOG
 
+## 0.9.0 _2021-08-02
+- Add Config.http_digest_auth.enable_rule
+
 ## 0.8.1 _2021-07-30
 - Fix Dockerfile
 
diff --git a/docs/usage.md b/docs/usage.md
index 85d704d7..01171b7f 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -190,13 +190,17 @@ INFO: [uvicorn] Uvicorn running on http://0.0.0.0:80 (Press CTRL+C to quit)
 ## `HTTPDigestAuth` Object
 
 - Introduced in 0.7.0
-- Last updated in 0.7.0
+- Last updated in 0.9.0
 
 | Key          | Value Type | Default Value |
 | ------------ | ---------- | ------------- |
 | enable       | bool       | `false`       |
+| enable_rule  | str        | ``            |
 | disable_rule | str        | `neon/`       |
 
+- When `enable` is `true`, the `disable_rule` is valid
+- When `enable` is `false`, the `enable_rule` is valid
+
 ## `Provider` Object
 
 - Introduced in 0.1