diff --git a/calculator.c b/calculator.c
index 176f397..0f5b3fa 100644
--- a/calculator.c
+++ b/calculator.c
@@ -6,7 +6,7 @@ void add(int a, int b)
 }
 void sub(int a, int b)
 {
-	printf("a - b = %d\n", a - b);
+    printf("a - b = %d\n", a - b); // 
 }
 void mul()
 {