diff --git a/msi.c b/msi.c
index 7e4303e..4915292 100644
--- a/msi.c
+++ b/msi.c
@@ -1,5 +1,10 @@
 /*
- * Microsoft Compound File Reader
+ * MSI file support library
+ *
+ * Copyright (C) 2021 Michał Trojnara <Michal.Trojnara@stunnel.org>
+ * Author: Małgorzata Olszówka <Malgorzata.Olszowka@stunnel.org>
+ *
+ * Reference specifications:
  * http://en.wikipedia.org/wiki/Compound_File_Binary_Format
  * https://msdn.microsoft.com/en-us/library/dd942138.aspx
  * https://github.com/microsoft/compoundfilereader
diff --git a/msi.h b/msi.h
index eb186bc..1ec95bf 100644
--- a/msi.h
+++ b/msi.h
@@ -1,3 +1,15 @@
+/*
+ * MSI file support library
+ *
+ * Copyright (C) 2021 Michał Trojnara <Michal.Trojnara@stunnel.org>
+ * Author: Małgorzata Olszówka <Malgorzata.Olszowka@stunnel.org>
+ *
+ * Reference specifications:
+ * http://en.wikipedia.org/wiki/Compound_File_Binary_Format
+ * https://msdn.microsoft.com/en-us/library/dd942138.aspx
+ * https://github.com/microsoft/compoundfilereader
+ */
+
 #include <stdint.h>
 #include <openssl/safestack.h>
 #include <openssl/bio.h>