diff --git a/main.py b/main.py
index 74e1f21..e3800b4 100644
--- a/main.py
+++ b/main.py
@@ -53,6 +53,7 @@ def userFacing(cfg: dict):
 	validCodeModes: set = {
 		'normal',
 		'backup',
+		'backup_let',
 		'both'
 	}
 	if cfg['codeMode'] not in validCodeModes: raise ValueError('Invalid code-generation mode inputted!')
@@ -68,4 +69,4 @@ def userFacing(cfg: dict):
 	except KeyboardInterrupt:
 		# Exit procedure taken from: https://stackoverflow.com/a/21144662
 		print(f"\n{color('Halting Program on KeyboardInterrupt...!', 'red')}")
-		sys.exit(130)
\ No newline at end of file
+		sys.exit(130)