diff --git a/README.md b/README.md
index 609de21..5f375c1 100644
--- a/README.md
+++ b/README.md
@@ -4,5 +4,8 @@ A few parts of the code (like decryption, encryption, server security, etc) has
 Examples:  
 - The int encrypt and int decrypt functions;  
 - In File "MHGdataHandle.h", line 87, please key in your own mongodb uri connection string for the code to work.  
+
+ I am using sha256 header files (that I modified slightly by excluding "#include <endian.h>") from https://create.stephan-brumme.com/hash-library/ (and I would like to thank them)
+under the zlib License.  
   
 Please also note that mongo-c-driver was used for the C++ code for mongodb connections (see [mongo-c-driver-download-link](http://mongoc.org/))