diff --git a/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java b/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
index 473df17..3f7fbcd 100644
--- a/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
+++ b/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
@@ -1,3 +1,20 @@
+/*
+ * gc-opencommand
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.opencommand;
 
 import com.github.jie65535.opencommand.json.JsonRequest;
diff --git a/src/main/java/com/github/jie65535/opencommand/OpenCommandPlugin.java b/src/main/java/com/github/jie65535/opencommand/OpenCommandPlugin.java
index 1e9eaf9..9390d09 100644
--- a/src/main/java/com/github/jie65535/opencommand/OpenCommandPlugin.java
+++ b/src/main/java/com/github/jie65535/opencommand/OpenCommandPlugin.java
@@ -1,3 +1,20 @@
+/*
+ * gc-opencommand
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.opencommand;
 
 import emu.grasscutter.Grasscutter;
diff --git a/src/main/java/com/github/jie65535/opencommand/json/JsonRequest.java b/src/main/java/com/github/jie65535/opencommand/json/JsonRequest.java
index 12dc16f..e88e426 100644
--- a/src/main/java/com/github/jie65535/opencommand/json/JsonRequest.java
+++ b/src/main/java/com/github/jie65535/opencommand/json/JsonRequest.java
@@ -1,3 +1,20 @@
+/*
+ * gc-opencommand
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.opencommand.json;
 
 public final class JsonRequest {
diff --git a/src/main/java/com/github/jie65535/opencommand/json/JsonResponse.java b/src/main/java/com/github/jie65535/opencommand/json/JsonResponse.java
index c7fb9e3..5a37837 100644
--- a/src/main/java/com/github/jie65535/opencommand/json/JsonResponse.java
+++ b/src/main/java/com/github/jie65535/opencommand/json/JsonResponse.java
@@ -1,3 +1,20 @@
+/*
+ * gc-opencommand
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.opencommand.json;
 
 public final class JsonResponse {