diff --git a/src/main/java/net/minecraftforge/common/extensions/IForgeLevelSummary.java b/src/main/java/net/minecraftforge/common/extensions/IForgeLevelSummary.java
index c17a38cc05..a2ebdcdf6e 100644
--- a/src/main/java/net/minecraftforge/common/extensions/IForgeLevelSummary.java
+++ b/src/main/java/net/minecraftforge/common/extensions/IForgeLevelSummary.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
 package net.minecraftforge.common.extensions;
 
 import net.minecraft.world.level.storage.LevelSummary;