diff --git a/ShadowsocksX-NG2/Domain/Credentials/MasterKeyStore.swift b/ShadowsocksX-NG2/Domain/Credentials/MasterKeyStore.swift
index 63d2f000..41743277 100644
--- a/ShadowsocksX-NG2/Domain/Credentials/MasterKeyStore.swift
+++ b/ShadowsocksX-NG2/Domain/Credentials/MasterKeyStore.swift
@@ -51,6 +51,10 @@ struct KeychainCredentialKeyStore: CredentialKeyStoring {
     }
   }
 
+  @diagnose(
+    DeprecatedDeclaration, as: ignored,
+    reason: "经典登录钥匙串使用 SecAccess ACL 限制获准应用访问"
+  )
   func create(_ data: Data, id: UUID, allowingInteraction: Bool) throws {
     try withClassicKeychainInteraction(allowingInteraction) {
       var application: SecTrustedApplication?
@@ -90,6 +94,10 @@ struct KeychainCredentialKeyStore: CredentialKeyStoring {
 }
 
 /// 经典钥匙串使用进程级交互开关。同步调用结束后恢复原值，不把交互许可留给后台操作。
+@diagnose(
+  DeprecatedDeclaration, as: ignored,
+  reason: "经典登录钥匙串需要显式控制交互许可，并在同步操作结束后恢复原值"
+)
 private func withClassicKeychainInteraction<T>(_ allowed: Bool, _ operation: () throws -> T) throws
   -> T
 {