diff --git a/core/src/main/java/me/filoghost/holographicdisplays/core/nms/ProtocolPacketSettings.java b/core/src/main/java/me/filoghost/holographicdisplays/core/nms/ProtocolPacketSettings.java
index b2f83d15..f88c2d8f 100644
--- a/core/src/main/java/me/filoghost/holographicdisplays/core/nms/ProtocolPacketSettings.java
+++ b/core/src/main/java/me/filoghost/holographicdisplays/core/nms/ProtocolPacketSettings.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.core.nms;
 
 public interface ProtocolPacketSettings {
diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/ChunkListener.java b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/ChunkListener.java
index c1afd890..d770c33d 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/ChunkListener.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/ChunkListener.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.listener;
 
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/SpawnListener.java b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/SpawnListener.java
index d3275c59..f4967804 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/SpawnListener.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/SpawnListener.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.listener;
 
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/UpdateNotificationListener.java b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/UpdateNotificationListener.java
index f4d76052..7779039f 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/listener/UpdateNotificationListener.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/listener/UpdateNotificationListener.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.listener;
 
 import me.filoghost.fcommons.logging.Log;
diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIItemLine.java b/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIItemLine.java
index 52404b36..c24aa88d 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIItemLine.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIItemLine.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.object.api;
 
 import me.filoghost.holographicdisplays.api.handler.PickupHandler;
diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APITextLine.java b/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APITextLine.java
index b977541a..e9b0aeca 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APITextLine.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APITextLine.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
 package me.filoghost.holographicdisplays.object.api;
 
 import me.filoghost.holographicdisplays.api.handler.TouchHandler;