diff --git a/mappings/net/minecraft/util/FixedBufferInputStream.mapping b/mappings/net/minecraft/util/FixedBufferInputStream.mapping
new file mode 100644
index 0000000000..583b0149c8
--- /dev/null
+++ b/mappings/net/minecraft/util/FixedBufferInputStream.mapping
@@ -0,0 +1,19 @@
+CLASS net/minecraft/class_6826 net/minecraft/util/FixedBufferInputStream
+	FIELD field_36209 DEFAULT_BUFFER_SIZE I
+	FIELD field_36210 stream Ljava/io/InputStream;
+	FIELD field_36211 buf [B
+	FIELD field_36212 end I
+	FIELD field_36213 start I
+	METHOD <init> (Ljava/io/InputStream;)V
+		ARG 1 stream
+	METHOD <init> (Ljava/io/InputStream;I)V
+		ARG 1 stream
+		ARG 2 size
+	METHOD method_39779 getAvailableBuffer ()I
+	METHOD method_39780 fill ()V
+	METHOD read ([BII)I
+		ARG 1 buf
+		ARG 2 offset
+		ARG 3 length
+	METHOD skip (J)J
+		ARG 1 n