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diff --git a/part_4/mylib/add3_ge5.v b/part_4/mylib/add3_ge5.v
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+//------------------------------
+// Module name: add3_ge5
+// Function: Add 3 to input if it is 5 or above
+// Creator:  Peter Cheung
+// Version:  1.0
+// Date:     21 Jan 2014
+//------------------------------
+
+module add3_ge5(w,a); 
+	input [3:0] w; 
+	output [3:0] a; 
+	reg [3:0] a; 
+ 
+	always @ (w) 
+		case (w) 
+			4'b0000: a <= 4'b0000; 
+			4'b0001: a <= 4'b0001; 
+			4'b0010: a <= 4'b0010; 
+			4'b0011: a <= 4'b0011; 
+			4'b0100: a <= 4'b0100; 
+			4'b0101: a <= 4'b1000; 
+			4'b0110: a <= 4'b1001; 
+			4'b0111: a <= 4'b1010; 
+			4'b1000: a <= 4'b1011; 
+			4'b1001: a <= 4'b1100;
+			4'b1010: a <= 4'b1101;	
+			4'b1011: a <= 4'b1110;	
+			4'b1100: a <= 4'b1111;	
+			default: a <= 4'b0000; // a cannot be 13 or larger, else overflow
+		endcase 
+endmodule 
+\ No newline at end of file