diff --git a/README.md b/README.md
index eb50069..08ab779 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ Code scanner library for [Android](https://developer.android.com), based on [ZXi
 ### Usage ([sample](https://github.com/yuriy-budiyev/lib-demo-app))
 
 Step 1. Add it in your root build.gradle at the end of repositories:
+
 ```gradle
 allprojects {
 
@@ -39,6 +40,7 @@ allprojects {
 ```
 
 or in settings.gradle file:
+
 ```gradle
 dependencyResolutionManagement {
 
@@ -50,12 +52,15 @@ dependencyResolutionManagement {
 ```
 
 Step 2. Add dependency:
+
 ```gradle
 dependencies {
-    implementation 'com.github.yuriy-budiyev:code-scanner:2.3.0'
+    implementation 'com.github.yuriy-budiyev:code-scanner:2.3.1'
 }
 ```
+
 Add camera permission and hardware feature to AndroidManifest.xml (Don't forget about dynamic permissions on API >= 23):
+
 ```xml
 <uses-permission android:name="android.permission.CAMERA"/>
 
@@ -63,34 +68,53 @@ Add camera permission and hardware feature to AndroidManifest.xml (Don't forget
     android:name="android.hardware.camera"
     android:required="false"/>
 ```
+
 Define a view in your layout file:
+
 ```xml
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
     <com.budiyev.android.codescanner.CodeScannerView
         android:id="@+id/scanner_view"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        app:autoFocusButtonColor="@android:color/white"
-        app:autoFocusButtonVisible="true"
-        app:flashButtonColor="@android:color/white"
-        app:flashButtonVisible="true"
-        app:frameColor="@android:color/white"
-        app:frameCornersSize="50dp"
-        app:frameCornersRadius="0dp"
-        app:frameAspectRatioWidth="1"
-        app:frameAspectRatioHeight="1"
-        app:frameSize="0.75"
-        app:frameThickness="2dp"
-        app:frameVerticalBias="0.5"
-        app:maskColor="#77000000"/>
+        android:layout_height="match_parent"/>
 </FrameLayout>
 ```
+
+You can use XML attributes to set view parameters:
+
+```
+maskColor
+maskVisible
+frameColor
+frameVisible
+frameThickness
+frameCornersSize
+frameCornersRadius
+frameAspectRatioWidth
+frameAspectRatioHeight
+frameSize
+frameVerticalBias
+autoFocusButtonColor
+autoFocusButtonVisible
+autoFocusButtonPaddingHorizontal
+autoFocusButtonPaddingVertical
+autoFocusButtonOnIcon
+autoFocusButtonOffIcon
+autoFocusButtonPosition
+flashButtonColor
+flashButtonVisible
+flashButtonPaddingHorizontal
+flashButtonPaddingVertical
+flashButtonOnIcon
+flashButtonOffIcon
+flashButtonPosition
+```
+
 And add following code to your activity:
 
 Kotlin
@@ -145,6 +169,7 @@ class MainActivity : AppCompatActivity() {
 ```
 
 Java
+
 ```java
 public class MainActivity extends AppCompatActivity {
     private CodeScanner mCodeScanner;
diff --git a/build.gradle b/build.gradle
index 7cac75b..e392bf1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'maven-publish'
 
 ext {
-    libraryVersion = '2.3.0'
+    libraryVersion = '2.3.1'
     publishedGroupId = 'com.budiyev.android'
 }
 
@@ -41,7 +41,7 @@ android {
     defaultConfig {
         minSdkVersion 19
         targetSdkVersion 32
-        versionCode 61
+        versionCode 62
         versionName libraryVersion
     }