diff --git a/README.md b/README.md
index 12f926a..aa04f9d 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,8 @@ registry synchronization (fabric-registry-sync mod).
   optionally [ViaRewind](https://viaversion.com/rewind))**:
   Your server can accept older versions. Your client can connect to newer versions.
 
+  Note: When using ViaFabric for versions older than 1.17, you need [Java 8 builds](https://ci.viaversion.com/)
+
 - Server-side: See https://viaversion.com/
 
 - Client-side:
diff --git a/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/MixinRegistrySyncManager.java b/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/MixinRegistrySyncManager.java
index 84fd19d..6f674f5 100644
--- a/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/MixinRegistrySyncManager.java
+++ b/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/MixinRegistrySyncManager.java
@@ -1,3 +1,20 @@
+/*
+ * This file is part of ViaFabric - https://github.com/ViaVersion/ViaFabric
+ * Copyright (C) 2018-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package com.viaversion.fabric.mc1204.mixin.debug;
 
 import com.viaversion.fabric.mc1204.ViaFabric;
diff --git a/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/client/MixinRegistrySyncManager.java b/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/client/MixinRegistrySyncManager.java
index 21f026d..cff7118 100644
--- a/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/client/MixinRegistrySyncManager.java
+++ b/viafabric-mc1204/src/main/java/com/viaversion/fabric/mc1204/mixin/debug/client/MixinRegistrySyncManager.java
@@ -1,3 +1,20 @@
+/*
+ * This file is part of ViaFabric - https://github.com/ViaVersion/ViaFabric
+ * Copyright (C) 2018-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package com.viaversion.fabric.mc1204.mixin.debug.client;
 
 import com.viaversion.fabric.mc1204.ViaFabric;
diff --git a/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/MixinRegistrySyncManager.java b/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/MixinRegistrySyncManager.java
index 336a64f..325c3a8 100644
--- a/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/MixinRegistrySyncManager.java
+++ b/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/MixinRegistrySyncManager.java
@@ -1,3 +1,20 @@
+/*
+ * This file is part of ViaFabric - https://github.com/ViaVersion/ViaFabric
+ * Copyright (C) 2018-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package com.viaversion.fabric.mc1206.mixin.debug;
 
 import com.viaversion.fabric.mc1206.ViaFabric;
diff --git a/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/client/MixinRegistrySyncManager.java b/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/client/MixinRegistrySyncManager.java
index 9a164f9..8baf3c1 100644
--- a/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/client/MixinRegistrySyncManager.java
+++ b/viafabric-mc1206/src/main/java/com/viaversion/fabric/mc1206/mixin/debug/client/MixinRegistrySyncManager.java
@@ -1,3 +1,20 @@
+/*
+ * This file is part of ViaFabric - https://github.com/ViaVersion/ViaFabric
+ * Copyright (C) 2018-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 package com.viaversion.fabric.mc1206.mixin.debug.client;
 
 import com.viaversion.fabric.mc1206.ViaFabric;