diff --git a/blockchain/modules/prices/README.md b/blockchain/modules/prices/README.md
new file mode 100644
index 00000000..11f30725
--- /dev/null
+++ b/blockchain/modules/prices/README.md
@@ -0,0 +1,10 @@
+بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيم
+
+# Prices Module
+
+## Overview
+
+The data from Oracle cannot be used in business, prices module will do some process and feed prices for Setheum. Process include:
+   - specify a fixed price for stable currency;
+   - feed price in USD or related price bewteen two currencies;
+   - lock/unlock the price data got from oracle;