diff --git a/README.md b/README.md
index 74c2b818..dc078973 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,15 @@ Tables](https://github.com/leo-yuriev/libfpta), aka ["Позитивные
 Technologies](https://www.ptsecurity.ru).
 
 
+## Acknowledgements
+
+Howard Chu (Symas Corporation) - the author of LMDB,
+from which originated the MDBX in 2015.
+
+Martin Hedenfalk <martin@bzero.se> - the author of `btree.c` code,
+which was used for begin development of LMDB.
+
+
 Характеристики и ключевые особенности
 =====================================
 
diff --git a/mdbx.h b/mdbx.h
index 416a8571..a35ffa79 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1,4 +1,5 @@
-/*
+/* LICENSE AND COPYRUSTING *****************************************************
+ *
  * Copyright 2015-2017 Leonid Yuriev <leo@yuriev.ru>
  * and other libmdbx authors: please see AUTHORS file.
  * All rights reserved.
@@ -45,6 +46,14 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
 
+/* ACKNOWLEDGEMENTS ************************************************************
+ *
+ * Howard Chu (Symas Corporation) - the author of LMDB,
+ * from which originated the MDBX in 2015.
+ *
+ * Martin Hedenfalk <martin@bzero.se> - the author of `btree.c` code,
+ * which was used for begin development of LMDB. */
+
 #pragma once
 #ifndef LIBMDBX_H
 #define LIBMDBX_H