diff --git a/mkdocs/changelog.md b/mkdocs/changelog.md
index cd6af8b..9b22f06 100644
--- a/mkdocs/changelog.md
+++ b/mkdocs/changelog.md
@@ -1,3 +1,12 @@
+### [0.9.9] May 25, 2019
+- Supports ESP8266 Arduino core 2.5.2.
+- Menu text/background color can be statically customized.
+- Added ID attribute to HTML tag generated from AutoConnectText.
+- Fixed the input box layout collapsed.
+- Fixed that the decoration of AutoConnectButton was disabled.
+- Fixed that the value remains even after clearing the option with AutoConnectSelect.
+- Fixed that an alignment violation exception occurred when loading AutoConnectAux described by JSON with PROGMEM attribute.
+
 #### [0.9.8] May 3, 2019
 - Supports ArduinoJson 6.9.1 or later.
 - Supports allocating JsonDocument buffer to PSRAM on ESP32 with ArduinoJson 6.10.0 or later.