diff --git a/2019/day04/aoc-c.c b/2019/day04/aoc-c.c
index 5cc300b..576c70a 100644
--- a/2019/day04/aoc-c.c
+++ b/2019/day04/aoc-c.c
@@ -1,4 +1,4 @@
-/* aoc-c.c: Advent of Code 2019, day 3 parts 1 & 2
+/* aoc-c.c: Advent of Code 2019, day 4 parts 1 & 2
  *
  * Copyright (C) 2021 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.