diff --git a/genprotimg/src/common.h b/genprotimg/src/common.h
index 401d690f..d0cef964 100644
--- a/genprotimg/src/common.h
+++ b/genprotimg/src/common.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright IBM Corp. 2020, 2022
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
 #ifndef COMMON_H
 #define COMMON_H
 
diff --git a/lsstp/lsstp.c b/lsstp/lsstp.c
index 93926cf1..8b29f47f 100644
--- a/lsstp/lsstp.c
+++ b/lsstp/lsstp.c
@@ -1,3 +1,12 @@
+/*
+ * lsstp - Display STP system information
+ *
+ * Copyright IBM Corp. 2020, 2022
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
diff --git a/ziomon/blktrace.h b/ziomon/blktrace.h
index 050e4c3e..0c2cffac 100644
--- a/ziomon/blktrace.h
+++ b/ziomon/blktrace.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright IBM Corp. 2008, 2022
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
 #ifndef BLKTRACE_H
 #define BLKTRACE_H