diff --git a/flutter/CHANGELOG.md b/flutter/CHANGELOG.md
index c1f9b631..87fd8be8 100644
--- a/flutter/CHANGELOG.md
+++ b/flutter/CHANGELOG.md
@@ -1,6 +1,6 @@
 # MMKV for Flutter Change Log
 
-## v1.2.8 / 2020-12-2x
+## v1.2.8 / 2020-12-25
 * Keep up with MMKV native lib v1.2.7, which fix the `MMKV.sync(false)` not being asynchronous bug.
 * Fix `MMKV.defaultMMKV()` crash on iOS simulator.
 * Fix `MMKV.defaultMMKV(cryptKey)` not encrypted as expected bug on iOS.
diff --git a/iOS/MMKVDemo/Config.xcconfig b/iOS/MMKVDemo/Config.xcconfig
new file mode 100644
index 00000000..bfb771f0
--- /dev/null
+++ b/iOS/MMKVDemo/Config.xcconfig
@@ -0,0 +1,10 @@
+//
+//  Config.xcconfig
+//  MMKVDemo
+//
+//  Created by lingol on 2020/12/31.
+//  Copyright © 2020 Lingol. All rights reserved.
+//
+
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974