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diff --git a/README.rst b/README.rst
index d0e872c..a9573fc 100644
--- a/README.rst
+++ b/README.rst
@@ -63,9 +63,13 @@ Development
 References
 ----------
 
+Since there is no publically available specification of how .NET viewstate is encoded, reverse engineering was based on prior work:
+
 - https://github.com/mutantzombie/JavaScript-ViewState-Parser
 - http://viewstatedecoder.azurewebsites.net/
 
+Any official documents would be gladly accepted to help improve the parsing logic.
+
 License
 -------
 MIT