diff --git a/ft_toupper.c b/ft_toupper.c
new file mode 100644
index 0000000..2028de4
--- /dev/null
+++ b/ft_toupper.c
@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int	ft_toupper(int c)
+{
+	if ('a' <= c && c <= 'z')
+		c -= 32;
+	return (c);
+}
diff --git a/libft.h b/libft.h
index 18c86f4..2260ad5 100644
--- a/libft.h
+++ b/libft.h
@@ -88,4 +88,13 @@ void	*ft_memmove(void *dst, const void *src, size_t n);
 */
 size_t	ft_strlcpy(char *dst, const char *src, size_t dstsize);
 
+// size_t	ft_strlcat(char *dst, const char *src, size_t dstsize);
+
+/*
+	The toupper() function converts a 
+	lower-case letter to the 
+	corresponding upper-case letter.
+*/
+int	ft_toupper(int c);
+
 #endif