diff --git a/bannerview/build.gradle b/bannerview/build.gradle
index ed47b79a..accb97b3 100644
--- a/bannerview/build.gradle
+++ b/bannerview/build.gradle
@@ -108,3 +108,5 @@ bintray {
 }
 
 //提交命令：gradlew bintrayUpload
+
+// mac ./gradlew bintrayUpload  没有权限使用申请 chmod +x gradlew
diff --git a/bannerview/src/main/java/com/zhpan/bannerview/BannerViewPager.java b/bannerview/src/main/java/com/zhpan/bannerview/BannerViewPager.java
index 0f68491b..23d9caa0 100644
--- a/bannerview/src/main/java/com/zhpan/bannerview/BannerViewPager.java
+++ b/bannerview/src/main/java/com/zhpan/bannerview/BannerViewPager.java
@@ -26,6 +26,10 @@
 import com.zhpan.bannerview.provider.ViewStyleSetter;
 import com.zhpan.bannerview.view.IndicatorView;
 
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
@@ -471,6 +475,8 @@ public void create() {
     }
 
     @IntDef({CENTER, START, END})
+    @Retention(RetentionPolicy.SOURCE)
+    @Target(ElementType.PARAMETER)
     public @interface IndicatorGravity {
     }
 }
diff --git a/gradlew b/gradlew
old mode 100644
new mode 100755