Update README.md

README.md

@@ -16,7 +16,7 @@ You can install the package via composer:
 composer require vdhicts/data-filter
 ```
 
-## Documentation
+## Usage
 
 Creating field is based on a key and a value:
 
@@ -28,8 +28,8 @@ $field = new Field($fieldKey, $fieldValue);
 ```
 
 A field has the ability to accept, reject or see the value as part of a range with a third optional parameter. These 
-parameters are constants of the field `APPROVAL_ACCEPT`, `APPROVAL_REJECT`, `APPROVAL_START_OF_RANGE` and 
-`APPROVAL_END_OF_RANGE`.
+parameters are constants of the field `APPROVAL_ACCEPT`, `APPROVAL_REJECT`, `APPROVAL_START_OF_RANGE`, 
+`APPROVAL_END_OF_RANGE`, `APPROVAL_IN` and `APPROVAL_NOT_IN`.
 
 The field is a member of a group. The group has a conjunction, which are constants of the group called 
 `CONJUNCTION_AND` and `CONJUCTION_OR`.