diff --git a/src/internal/slibtool_dprintf_impl.c b/src/internal/slibtool_dprintf_impl.c
index a6d3482..f63a026 100644
--- a/src/internal/slibtool_dprintf_impl.c
+++ b/src/internal/slibtool_dprintf_impl.c
@@ -1,3 +1,9 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016--2018  Z. Gilboa                            */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
diff --git a/src/internal/slibtool_mapfile_impl.c b/src/internal/slibtool_mapfile_impl.c
index 3a086de..2b1b839 100644
--- a/src/internal/slibtool_mapfile_impl.c
+++ b/src/internal/slibtool_mapfile_impl.c
@@ -1,3 +1,9 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016--2018  Z. Gilboa                            */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
 #ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 200809L
 #endif