diff --git a/mappings/net/minecraft/util/PacketByteBuf.mapping b/mappings/net/minecraft/util/PacketByteBuf.mapping
new file mode 100644
index 0000000000..177e279b4b
--- /dev/null
+++ b/mappings/net/minecraft/util/PacketByteBuf.mapping
@@ -0,0 +1,50 @@
+CLASS none/es net/minecraft/util/PacketByteBuf
+	FIELD a underlying Lio/netty/buffer/ByteBuf;
+	METHOD <init> (Lio/netty/buffer/ByteBuf;)V
+		ARG 0 underlying
+	METHOD a readByteArray ()[B
+	METHOD a readEnumConstant (Ljava/lang/Class;)Ljava/lang/Enum;
+		ARG 0 enumClass
+	METHOD a writeEnumConstant (Ljava/lang/Enum;)Lnone/es;
+		ARG 0 value
+	METHOD a writeString (Ljava/lang/String;)Lnone/es;
+		ARG 0 str
+	METHOD a writeUUID (Ljava/util/UUID;)Lnone/es;
+		ARG 0 uuid
+	METHOD a writeItemStack (Lnone/aeq;)Lnone/es;
+		ARG 0 stack
+	METHOD a writeBlockPos (Lnone/cn;)Lnone/es;
+		ARG 0 pos
+	METHOD a writeTagCompound (Lnone/dt;)Lnone/es;
+		ARG 0 tag
+	METHOD a writeTextComponent (Lnone/fa;)Lnone/es;
+		ARG 0 component
+	METHOD a writeByteArray ([B)Lnone/es;
+		ARG 0 array
+	METHOD a writeIntArray ([I)Lnone/es;
+		ARG 0 array
+	METHOD a writeLongArray ([J)Lnone/es;
+		ARG 0 array
+	METHOD a readLongArray ([JI)[J
+		ARG 0 toArray
+		ARG 1 size
+	METHOD b readIntArray ()[I
+	METHOD b readByteArray (I)[B
+		ARG 0 length
+	METHOD b writeVarLong (J)Lnone/es;
+		ARG 0 value
+	METHOD b readLongArray ([J)[J
+		ARG 0 toArray
+	METHOD c readIntArray (I)[I
+		ARG 0 size
+	METHOD d writeVarInt (I)Lnone/es;
+		ARG 0 value
+	METHOD e readBlockPos ()Lnone/cn;
+	METHOD e readString (I)Ljava/lang/String;
+		ARG 0 maxLength
+	METHOD f readTextComponent ()Lnone/fa;
+	METHOD g readVarInt ()I
+	METHOD h readVarLong ()J
+	METHOD i readUUID ()Ljava/util/UUID;
+	METHOD j readTagCompound ()Lnone/dt;
+	METHOD k readItemStack ()Lnone/aeq;