diff --git a/entry/src/main/java/uk/co/deanwild/materialshowcaseviewsample/util/ToastUtil.java b/entry/src/main/java/uk/co/deanwild/materialshowcaseviewsample/util/ToastUtil.java
index 15dd91eedf417f9d88cc29e0eb87d593f1cf225f..5af5620eb5d8c192f645716435cdfed8b88734c1 100644
--- a/entry/src/main/java/uk/co/deanwild/materialshowcaseviewsample/util/ToastUtil.java
+++ b/entry/src/main/java/uk/co/deanwild/materialshowcaseviewsample/util/ToastUtil.java
@@ -31,6 +31,11 @@ public class ToastUtil {
     private ToastUtil() {
     }
 
+    /**
+     * 实例
+     *
+     * @return 实例
+     */
     public static ToastUtil getInstance() {
         return ToastUtilInstance.INSTANCE;
     }
diff --git a/entry/src/test/java/uk/co/deanwild/materialshowcaseviewsample/ExampleTest.java b/entry/src/test/java/uk/co/deanwild/materialshowcaseviewsample/ExampleTest.java
index 81c62cccc0ef8097a43935e0bdde0d8a5aaf086f..9b50cf99d99ea49f1745959416a117fd79e8d86b 100644
--- a/entry/src/test/java/uk/co/deanwild/materialshowcaseviewsample/ExampleTest.java
+++ b/entry/src/test/java/uk/co/deanwild/materialshowcaseviewsample/ExampleTest.java
@@ -3,6 +3,10 @@ package uk.co.deanwild.materialshowcaseviewsample;
 import org.junit.Test;
 
 public class ExampleTest {
+
+    /**
+     * 单元测试开始
+     */
     @Test
     public void onStart() {
     }
diff --git a/library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/Shape.java b/library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/Shape.java
index 96640428d35d8ea3abc5a9b78c069d0c4baf7d1b..a27e2a03f0af087505732fe6dc7cce14235a2671 100644
--- a/library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/Shape.java
+++ b/library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/Shape.java
@@ -14,21 +14,32 @@ public interface Shape {
 
     /**
      * Draw shape on the canvas with the center at (x, y) using Paint object provided.
+     *
+     * @param canvas canvas
+     * @param paint paint
+     * @param x x
+     * @param y y
      */
     void draw(Canvas canvas, Paint paint, int x, int y);
 
     /**
      * Get width of the shape.
+     *
+     * @return int
      */
     int getWidth();
 
     /**
      * Get height of the shape.
+     *
+     * @return int
      */
     int getHeight();
 
     /**
      * Update shape bounds if necessary
+     *
+     * @param target target
      */
     void updateTarget(Target target);
 
diff --git a/library/src/test/java/uk/co/deanwild/materialshowcaseview/ExampleTest.java b/library/src/test/java/uk/co/deanwild/materialshowcaseview/ExampleTest.java
index 63b58d2e61d311c2dcd8394d7a1775d9701513c1..a5855ba372531214c9547c6aad6bb5bd534aed34 100644
--- a/library/src/test/java/uk/co/deanwild/materialshowcaseview/ExampleTest.java
+++ b/library/src/test/java/uk/co/deanwild/materialshowcaseview/ExampleTest.java
@@ -3,6 +3,10 @@ package uk.co.deanwild.materialshowcaseview;
 import org.junit.Test;
 
 public class ExampleTest {
+
+    /**
+     * 单元测试开始
+     */
     @Test
     public void onStart() {
     }