diff --git a/src/testmod/java/io/github/ladysnake/paltest/mixin/LivingEntityMixin.java b/src/testmod/java/io/github/ladysnake/paltest/mixin/LivingEntityMixin.java
index 3cfabce..7b428da 100644
--- a/src/testmod/java/io/github/ladysnake/paltest/mixin/LivingEntityMixin.java
+++ b/src/testmod/java/io/github/ladysnake/paltest/mixin/LivingEntityMixin.java
@@ -1,3 +1,20 @@
+/*
+ * PlayerAbilityLib
+ * Copyright (C) 2019-2023 Ladysnake
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; If not, see <https://www.gnu.org/licenses>.
+ */
 package io.github.ladysnake.paltest.mixin;
 
 import io.github.ladysnake.paltest.FlightEffect;