diff --git a/constants.asm b/constants.asm
index 76d186b88..41f713b54 100644
--- a/constants.asm
+++ b/constants.asm
@@ -5,6 +5,10 @@ dwb: MACRO
 	db \2
 	ENDM
 
+dn: MACRO
+	db \1 << 4 + \2
+	ENDM
+
 callab: MACRO
 	ld hl, \1
 	ld a, BANK(\1)