diff --git a/sum.c b/sum.c
index cb90204..995a048 100644
--- a/sum.c
+++ b/sum.c
@@ -15,7 +15,7 @@ int main() {
   int* arr = malloc(size * sizeof(int));
   
   while(end_scan) {
-    printf("Enter a number: ");
+    printf("(Type EOF to end) Enter a number: ");
     if (scanf("%d", &(arr[pos])) == EOF) {
       end_scan = 0;
     }