diff --git a/README.md b/README.md
index c592fe2..6554509 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ To make gradient, you need to define it from code:
 
 ```java
 int[] intArray = getResources().getIntArray(R.array.progressGradientColors);
-seekArc.setProgressGradient(intArray);
+arcSeekBar.setProgressGradient(intArray);
 ```
 
 [Here](https://github.com/MarcinMoskala/ArcSeekBar/blob/master/app/src/main/res/values/colors.xml) you can find array definition.
@@ -70,8 +70,8 @@ ArcSeekBar properties are:
 * `enabled` is progress enabled or not (`true` by default). For disabled there is no thumb displayed.
 
 Each property can be changes pragmatically, and additionally gradient progress or background can be set using:
-* `setProgressGradient`
-* `setProgressBackgroundGradient`
+* `setProgressGradient` e.g. `arcSeekBar.setProgressGradient(Color.GREEN, Color.BLUE, Color.YELLOW);`
+* `setProgressBackgroundGradient` e.g. `arcSeekBar.setProgressBackgroundGradient(Color.GREEN, Color.BLUE, Color.YELLOW);`
 
 ## Installation
 
diff --git a/app/src/main/java/com/marcinmoskala/arcseekbar/MainActivity.java b/app/src/main/java/com/marcinmoskala/arcseekbar/MainActivity.java
index 9eea41b..e5731c5 100644
--- a/app/src/main/java/com/marcinmoskala/arcseekbar/MainActivity.java
+++ b/app/src/main/java/com/marcinmoskala/arcseekbar/MainActivity.java
@@ -1,5 +1,6 @@
 package com.marcinmoskala.arcseekbar;
 
+import android.graphics.Color;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
@@ -11,9 +12,9 @@ public class MainActivity extends AppCompatActivity {
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        ArcSeekBar seekArc = findViewById(R.id.seekArc);
+        ArcSeekBar arcSeekBar = findViewById(R.id.seekArc);
 
-        seekArc.setOnProgressChangedListener(new ProgressListener() {
+        arcSeekBar.setOnProgressChangedListener(new ProgressListener() {
             @Override
             public void invoke(int progress) {
                 Log.i("SeekBar", "Value is " + progress);
@@ -21,6 +22,6 @@ public void invoke(int progress) {
         });
 
         int[] intArray = getResources().getIntArray(R.array.progressGradientColors);
-        seekArc.setProgressGradient(intArray);
+        arcSeekBar.setProgressGradient(intArray);
     }
 }