diff --git a/README.md b/README.md
index b3dab79ad553f289018fcb66d81d23e0dd3c5856..53c9626ccfe703a86d382ca913e7de55ef5b9054 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,7 @@
 # libdap-chain
-Deus Applications Prototypes: blockchain library
+
+Deus Applications Prototypes: blockchain library. 
+
+## Fisrt Post-Quantum Blockchain
+
+based on the post-quantum alghorythmes, forked from https://github.com/open-quantum-safe/liboqs - part of Open Quantum Safe project https://openquantumsafe.org/
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diff --git a/dap_chain.h b/dap_chain.h
index afa954b39da04900bac64c135c58f51996d8ff11..7907236d9e45ff4262ef50da8e479dcfead6264f 100644
--- a/dap_chain.h
+++ b/dap_chain.h
@@ -22,5 +22,9 @@
 #ifndef _DAP_CHAIN_H_
 #define _DAP_CHAIN_H_
 
+typedef struct dap_chain{
+    void * _internal;
+    void * _inhertor;
+} dap_chain_t;
 
 #endif
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