diff --git a/hal/instructions.go b/hal/instructions.go
index 7e64679..afd1969 100644
--- a/hal/instructions.go
+++ b/hal/instructions.go
@@ -40,6 +40,7 @@ var instructions = []*Instruction{
 	InstructionStop,
 	InstructionIn,
 	InstructionOut,
+	InstructionAddnum,
 }
 
 var InstructionStart = &Instruction{
@@ -70,3 +71,10 @@ var InstructionIn = &Instruction{
 		// TODO implement
 	},
 }
+
+var InstructionAddnum = &Instruction{
+	Name: "ADDNUM",
+	ExecuteWithOperand: func(module *Module, operand float64) {
+		module.accumulator = module.accumulator + operand
+	},
+}