diff --git a/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/MemoryUtil.java b/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/MemoryUtil.java
index c6fc6443..3b62bab9 100644
--- a/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/MemoryUtil.java
+++ b/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/MemoryUtil.java
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package cn.hippo4j.common.toolkit;
 
 import lombok.AccessLevel;
@@ -20,7 +37,6 @@ public class MemoryUtil {
     static MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
     static MemoryUsage noHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();
 
-
     /**
      * get used memory in heap
      *
@@ -39,7 +55,6 @@ public class MemoryUtil {
         return heapMemoryUsage.getMax();
     }
 
-
     /**
      * get free memory in heap
      *
@@ -67,7 +82,6 @@ public class MemoryUtil {
         return noHeapMemoryUsage.getMax();
     }
 
-
     /**
      * get free memory in no-heap
      *
diff --git a/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/MemoryUtilTest.java b/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/MemoryUtilTest.java
index 87f8c5fa..3009804e 100644
--- a/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/MemoryUtilTest.java
+++ b/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/MemoryUtilTest.java
@@ -1,5 +1,21 @@
-package cn.hippo4j.common.toolkit;
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
+package cn.hippo4j.common.toolkit;
 
 import org.junit.Assert;
 import org.junit.Test;