diff --git a/mkdocs/apielements.md b/mkdocs/apielements.md
index d416271..40074ca 100644
--- a/mkdocs/apielements.md
+++ b/mkdocs/apielements.md
@@ -230,6 +230,18 @@ Returns type of AutoConnectElement.
AC_Input
+#### isValid
+
+```cpp
+bool isValid(void)
+```
+Evaluate the pattern as a regexp and return whether value matches. Always return true if the pattern is undefined.
+
+
**Return value**
+
trueThe value matches a pattern.
+
falseThe value does not match a pattern.
+
+
## AutoConnectRadio
### Constructor
@@ -332,10 +344,10 @@ Indicates the check of the specified option for the radio buttons. You can use t
```cpp
void empty(const size_t reserve = 0)
```
-Clear the array of option strings that AutoConnectRadio has in values. When a **_reserve_** parameter is specified, a vector container of that size is reserved.
+Clear the array of option strings that AutoConnectRadio has in the values. When a **_reserve_** parameter is specified, a vector container of that size is reserved.
**Parameters**
-
reserveReserved size of a container for option strings.
+
reserveReserved size of a container for the radio button option strings.
#### operator [ ]
@@ -343,10 +355,23 @@ Clear the array of option strings that AutoConnectRadio has in values. When a **
```cpp
const String& operator[] (const std::size_t n)
```
-Returns the option string of the index specified by **_n_**.
+Returns a value string of the index specified by **_n_**.
**Parameters**
-
nIndex of values array to return.
+
nIndex of values array to return. Its base number is 0.
+
**Return value**
+
A reference of a value string indexed by the specified the **n**.
+
+
+#### size
+
+```cpp
+size_t size(void)
+```
+Returns number of options which contained.
+
+
**Return value**
+
Number of options which contained.
#### value
@@ -418,25 +443,150 @@ Returns type of AutoConnectElement.
```cpp
void add(const String& option)
```
+Adds a selectable option string for the selection list.
+
+
**Parameters**
+
optionA string of selectable item to be contained in the select element.
+
#### empty
```cpp
void empty(const size_t reserve = 0)
```
+Clear the array of options list that AutoConnectSelect has in the options. When a **_reserve_** parameter is specified, a vector container of that size is reserved.
+
+
**Parameters**
+
reserveReserved size of a container for the options.
+
+
+#### operator [ ]
+
+```cpp
+const String& operator[] (const std::size_t n)
+```
+Returns an option string of the index specified by **_n_**.
+
+
**Parameters**
+
nIndex of options array to return. Its base number is 0.
+
**Return value**
+
A reference of a option string indexed by the specified the **n**.
+
+
#### size
```cpp
size_t size(void)
```
+Returns number of options which contained.
+