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diff --git a/projects/01/DMux4Way.hdl b/projects/01/DMux4Way.hdl
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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/01/DMux4Way.hdl
+
+/**
+ * 4-way demultiplexor:
+ * {a, b, c, d} = {in, 0, 0, 0} if sel == 00
+ *                {0, in, 0, 0} if sel == 01
+ *                {0, 0, in, 0} if sel == 10
+ *                {0, 0, 0, in} if sel == 11
+ */
+
+CHIP DMux4Way {
+    IN in, sel[2];
+    OUT a, b, c, d;
+
+    PARTS:
+    DMux(in=in, sel=sel[1], a=ab, b=cd);
+    DMux(in=ab, sel=sel[0], a=a, b=b);
+    DMux(in=cd, sel=sel[0], a=c, b=d);
+}