diff --git a/build-data/dev-imports.txt b/build-data/dev-imports.txt
new file mode 100644
index 000000000..302359e8a
--- /dev/null
+++ b/build-data/dev-imports.txt
@@ -0,0 +1,15 @@
+# You can use this file to import files from minecraft libraries into the project
+# format:
+#     <artifactId> <fileName>
+# both fully qualified and a file based syntax are accepted for <fileName>:
+#     authlib com/mojang/authlib/yggdrasil/YggdrasilGameProfileRepository.java
+#     datafixerupper com.mojang.datafixers.DataFixerBuilder
+#     datafixerupper com/mojang/datafixers/util/Either.java
+# To import classes from the vanilla Minecraft jar use `minecraft` as the artifactId:
+#     minecraft net.minecraft.world.level.entity.LevelEntityGetterAdapter
+#     minecraft net/minecraft/world/level/entity/LevelEntityGetter.java
+# To import minecraft data files, like the default chat type, use `mc_data` as the prefix:
+#     mc_data chat_type/chat.json
+#     mc_data dimension_type/overworld.json
+#
+
diff --git a/build-data/mappings-patch.tiny b/build-data/mappings-patch.tiny
new file mode 100644
index 000000000..14a2a3582
--- /dev/null
+++ b/build-data/mappings-patch.tiny
@@ -0,0 +1,5 @@
+tiny	2	0	spigot	mojang+yarn
+
+# Originally DistanceManager, which also implements DistanceManager, so clashes since the implemented class
+# is imported and not fully qualified. Easiest fix is to just change the name
+c	net/minecraft/server/level/PlayerChunkMap$a	net/minecraft/server/level/ChunkMap$ChunkDistanceManager