diff --git a/src/main/java/com/alibaba/druid/pool/ha/balance/Balancer.java b/src/main/java/com/alibaba/druid/pool/ha/balance/Balancer.java
index 9be4966055..6b7bf18b12 100644
--- a/src/main/java/com/alibaba/druid/pool/ha/balance/Balancer.java
+++ b/src/main/java/com/alibaba/druid/pool/ha/balance/Balancer.java
@@ -7,7 +7,10 @@ import com.alibaba.druid.pool.ha.MultiDataSource;
 import com.alibaba.druid.pool.ha.MultiDataSourceConnection;
 
 public interface Balancer {
+
     void init(MultiDataSource dataSource);
+
     void afterDataSourceChanged(Object event);
+
     MultiConnectionHolder getConnection(MultiDataSourceConnection connectionProxy, String sql) throws SQLException;
 }