diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index 5b0038b..0a82a09 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -107,6 +107,8 @@ SW_BARCODE_NAMES = {
     for name in barcode.PROVIDED_BARCODES
 }
 
+Alignment = Union[Literal["center", "left", "right"], str]
+
 
 class Escpos(object, metaclass=ABCMeta):
     """ESC/POS Printer object.