diff --git a/pty.c b/pty.c
index a3e43b0..bf0b0f7 100644
--- a/pty.c
+++ b/pty.c
@@ -1,3 +1,4 @@
+/* See LICENSE file for copyright and license details. */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/std.c b/std.c
index 1b918f5..3fd07a4 100644
--- a/std.c
+++ b/std.c
@@ -1,3 +1,4 @@
+/* See LICENSE file for copyright and license details. */
 #include <sys/ioctl.h>
 #include <sys/select.h>
 #include <sys/stat.h>