diff --git a/include/builtins.h b/include/builtins.h
new file mode 100644
index 0000000..9cd9627
--- /dev/null
+++ b/include/builtins.h
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   builtins.h                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/10/29 22:09:51 by sede-san          #+#    #+#             */
+/*   Updated: 2025/10/30 00:46:17 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef BUILTINS_H
+# define BUILTINS_H
+
+# include "minishell.h"
+
+/******************************************************************************/
+/*                                 Functions                                  */
+/******************************************************************************/
+
+// pwd.c
+
+extern u_int8_t	builtin_pwd(void);
+
+#endif /* BUILTINS_H */