diff --git a/multibackstack/src/main/java/com/jetradar/multibackstack/BaseAbilitySlice.java b/multibackstack/src/main/java/com/jetradar/multibackstack/BaseAbilitySlice.java
index 13f7ac6ec754fc261e52abbd25787249c1683f63..469e7ded8f1e60a0e306cf3a6f016c457923df43 100644
--- a/multibackstack/src/main/java/com/jetradar/multibackstack/BaseAbilitySlice.java
+++ b/multibackstack/src/main/java/com/jetradar/multibackstack/BaseAbilitySlice.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2021 Huawei Device Co., Ltd.
+ * Licensed 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 com.jetradar.multibackstack;
 
 import com.jetradar.multibackstack.bean.Action;
diff --git a/multibackstack/src/main/java/com/jetradar/multibackstack/minterface/CallBack.java b/multibackstack/src/main/java/com/jetradar/multibackstack/minterface/CallBack.java
index 1c65569cc2aef27118970c3fb48fd05e550bf05d..a464eadf5f6d7aa4efe7aa2d0d6dcec099a67d56 100644
--- a/multibackstack/src/main/java/com/jetradar/multibackstack/minterface/CallBack.java
+++ b/multibackstack/src/main/java/com/jetradar/multibackstack/minterface/CallBack.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2021 Huawei Device Co., Ltd.
+ * Licensed 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 com.jetradar.multibackstack.minterface;
 
 import ohos.aafwk.ability.fraction.Fraction;