diff --git a/mappings/net/minecraft/world/chunk/storage/RegionFile.mapping b/mappings/net/minecraft/world/chunk/storage/RegionFile.mapping
index c309023392..8640584b96 100644
--- a/mappings/net/minecraft/world/chunk/storage/RegionFile.mapping
+++ b/mappings/net/minecraft/world/chunk/storage/RegionFile.mapping
@@ -14,6 +14,7 @@ CLASS bqy net/minecraft/world/chunk/storage/RegionFile
 	FIELD h lastModified J
 	METHOD a getChunkDataInputStream (II)Ljava/io/DataInputStream;
 		ARG 1 x
+		ARG 2 z
 	METHOD a setOffset (III)V
 		ARG 1 x
 		ARG 2 z
@@ -26,15 +27,19 @@ CLASS bqy net/minecraft/world/chunk/storage/RegionFile
 		ARG 2 data
 	METHOD b (II)Z
 		ARG 1 x
+		ARG 2 z
 	METHOD b setTimestamp (III)V
 		ARG 1 x
 		ARG 2 z
 	METHOD c close ()V
-	METHOD c (II)Ljava/io/DataOutputStream;
+	METHOD c getChunkDataOutputStream (II)Ljava/io/DataOutputStream;
 		ARG 1 x
+		ARG 2 z
 	METHOD d hasChunk (II)Z
 		ARG 1 x
 	METHOD e outOfBounds (II)Z
 		ARG 1 x
+		ARG 2 z
 	METHOD f getOffset (II)I
 		ARG 1 x
+		ARG 2 z
diff --git a/mappings/net/minecraft/world/chunk/storage/RegionFileCache.mapping b/mappings/net/minecraft/world/chunk/storage/RegionFileCache.mapping
new file mode 100644
index 0000000000..64efe251f8
--- /dev/null
+++ b/mappings/net/minecraft/world/chunk/storage/RegionFileCache.mapping
@@ -0,0 +1,15 @@
+CLASS bqz net/minecraft/world/chunk/storage/RegionFileCache
+	FIELD a CACHE Ljava/util/Map;
+	METHOD a clear ()V
+	METHOD a getRegionFile (Ljava/io/File;II)Lbqy;
+		ARG 0 basePath
+		ARG 1 chunkX
+		ARG 2 chunkZ
+	METHOD d getChunkDataInputStream (Ljava/io/File;II)Ljava/io/DataInputStream;
+		ARG 0 basePath
+		ARG 1 chunkX
+		ARG 2 chunkZ
+	METHOD e getChunkDataOutputStream (Ljava/io/File;II)Ljava/io/DataOutputStream;
+		ARG 0 basePath
+		ARG 1 chunkX
+		ARG 2 chunkZ