diff --git a/README.md b/README.md
index b7f07c8..4b4b999 100644
--- a/README.md
+++ b/README.md
@@ -15,12 +15,6 @@ The blockchain is an incorruptible digital ledger of economic transactions that
   - [Contents](#contents)
   - [Frequently Asked Questions (F.A.Q.s) & Answers](#frequently-asked-questions-faqs--answers)
   - [Basic Introduction](#basic-introduction)
-    - [Consensus](#consensus)
-    - [Account and transaction model](#account-and-transaction-model)
-    - [Exchange](#exchange)
-    - [Applications](#applications)
-    - [Governance](#governance)
-    - [Digital currency ranking](#digital-currency-ranking)
   - [Development Tutorial](#development-tutorial)
     - [BitCoin](#bitcoin)
     - [Ethereum](#ethereum)
@@ -45,7 +39,7 @@ The blockchain is an incorruptible digital ledger of economic transactions that
   - [Further Extension](#further-extension)
     - [Papers](#papers)
     - [Books](#books)
-    - [Applications](#applications-1)
+    - [Applications](#applications)
       - [Identity Applications](#identity-applications)
         - [Public Blockchain Identity](#public-blockchain-identity)
         - [Blockchain as a collateral](#blockchain-as-a-collateral)
@@ -284,6 +278,9 @@ These apps run on a custom built **blockchain, an enormously powerful shared glo
 -   [IBM OpenTech Hyperledger Fabric 1.4 LTS Course](https://space.bilibili.com/102734951/channel/detail?cid=69148)
 -   [edx: Introduction to Hyperledger Blockchain Technologies Free Course](https://www.edx.org/course/introduction-to-hyperledger-blockchain-technologie)
 
+-   [Explorer Proposal](https://docs.google.com/document/d/1GuVNHZ5Jqq-gTVKflnZ1YiJfEoozvugqenC6QEQFQj4/edit)
+-   [Explorer doc](https://blockchain-explorer.readthedocs.io/en/master/architecture/index.html)
+
 #### [XuperChain](https://github.com/xuperchain/xuperchain)
 [<img src="https://avatars3.githubusercontent.com/u/43258643?s=200&v=4" align="right" width="80">](https://xchain.baidu.com/)