diff --git a/README.md b/README.md
index fe014a8..73b73ff 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,7 @@ Full documentation is available on https://Hieromon.github.io/AutoConnect, some
- Supports Arduino core for ESP32 1.0.3.
- Supports AutoConnectUpdate for the OTA update.
- Supports Preferences for saving credentials with ESP32 core 1.0.3 and later. **In ESP32, the credentials stored past in EEPROM will lose**.
+- Supports AutoConnectAux::isValid function.
### [0.9.12] Aug. 18, 2019
- Fixed missing captive portal notifications on the newer mobile OS client. As a result of this fix, the SoftAP default IP address and gateway have been changed to **172.217.28.1**. (issue #85)
diff --git a/mkdocs/apiaux.md b/mkdocs/apiaux.md
index 1679b15..06749fd 100644
--- a/mkdocs/apiaux.md
+++ b/mkdocs/apiaux.md
@@ -100,6 +100,18 @@ Returns whether embedded in the menu or not. The isMenu is a function that compl
falseThis custom Web page is not currently a menu item.
+### isValid
+
+```cpp
+bool isValid(void)
+```
+Performs [validation](apielements.md#isvalid) of all [AutoConnectInput](apielements.md#autoconnectinput) elements owned by AutoConnectAux and returns the result. The isValid function will return the true even if the AutoConnectAux does not own AutoConnectInputs.
+
+ - **Return value**
+ - trueValidation is successful. A value of all AutoConnectInputs match with each pattern.
+ - falseSome elements failed validation.
+
+
### load
```cpp
diff --git a/mkdocs/changelog.md b/mkdocs/changelog.md
index a9bbb53..5e20316 100644
--- a/mkdocs/changelog.md
+++ b/mkdocs/changelog.md
@@ -2,6 +2,7 @@
- Supports Arduino core for ESP32 1.0.3.
- Supports AutoConnectUpdate for the [OTA update](otaupdate.md).
- Supports Preferences for saving credentials with ESP32 core 1.0.3 and later. **In ESP32, the credentials stored past in EEPROM will lose**.
+- Supports [**AutoConnectAux::isValid**](apiaux.md#isvalid) function.
#### [0.9.12] Aug. 18, 2019
- Fixed missing captive portal notifications on the newer mobile OS client. As a result of this fix, the SoftAP default IP address and gateway have been changed to **172.217.28.1**.