diff --git a/Euler1.c b/Euler1.c
index 07197c3..4b09949 100644
--- a/Euler1.c
+++ b/Euler1.c
@@ -1,3 +1,4 @@
+// Euler1.c
 #include <stdio.h>
 
 int main(){
@@ -10,4 +11,4 @@ int main(){
 	}
 	printf("%d\n", sum);
 	return 0;
-}
\ No newline at end of file
+}