diff --git a/Makefile b/Makefile
index 166c9ba..96e3796 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 #    By: kcolin <marvin@42.fr>                      +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2024/10/14 13:43:59 by kcolin            #+#    #+#              #
-#    Updated: 2024/10/16 09:58:22 by kcolin           ###   ########.fr        #
+#    Updated: 2024/10/16 10:30:28 by kcolin           ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -24,7 +24,8 @@ SOURCES = ft_isalpha.c \
 	ft_memmove.c \
 	ft_strlcpy.c \
 	ft_strlcat.c \
-	ft_toupper.c
+	ft_toupper.c \
+	ft_tolower.c
 OBJECTS = $(SOURCES:.c=.o)
 CC = gcc
 
diff --git a/ft_tolower.c b/ft_tolower.c
new file mode 100644
index 0000000..18122eb
--- /dev/null
+++ b/ft_tolower.c
@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_tolower.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/16 10:30:41 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/16 10:31:43 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		c += 0x20;
+	return (c);
+}
+
+/*
+#include <stdio.h>
+#include <ctype.h>
+
+int	main(void)
+{
+	int	i;
+
+	i = 0;
+	while (i < 256)
+	{
+		printf("%d\t%c\t%c\t%c\n", i, i, ft_tolower(i), tolower(i));
+		i++;
+	}
+	return (0);
+}
+*/
diff --git a/libft.h b/libft.h
index 48ca73c..fa3b5f4 100644
--- a/libft.h
+++ b/libft.h
@@ -31,5 +31,6 @@ t_size	ft_strlcpy(char *dst, const char *src, t_size size);
 t_size	ft_strlcat(char *dst, const char *src, t_size size);
 
 int		ft_toupper(int c);
+int		ft_tolower(int c);
 
 #endif