diff --git a/README.md b/README.md
index ad0cd77..1896ef4 100644
--- a/README.md
+++ b/README.md
@@ -183,16 +183,17 @@ The "classic" Satoshi-blockchain is like a git repo with a single master branch
 -   [Ethereum problems](https://github.com/ethereum/wiki/wiki/Problems)
 
 ### Consortium Blockchain
--   [The Byzantine Generals Problem](https://people.eecs.berkeley.edu/~luca/cs174/byzantine.pdf)
--   [Is consortium blockchain better?](http://www.infoq.com/cn/news/2018/10/is-consortium-blockchain-better)   
--   [5 consortium blockchain comparison](http://www.infoq.com/cn/articles/5-consortium-blockchain-comparison) / [quick version](https://upload-images.jianshu.io/upload_images/11336404-f753396df0e930c8.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)    
--   [FISCO BCOS vs Fabric](http://www.infoq.com/cn/news/2018/09/uncover-consortium-blockchain)   
+*   **Theory**
+    -   [The Byzantine Generals Problem](https://people.eecs.berkeley.edu/~luca/cs174/byzantine.pdf)
+    -   [Is consortium blockchain better?](http://www.infoq.com/cn/news/2018/10/is-consortium-blockchain-better)   
+    -   [5 consortium blockchain comparison](http://www.infoq.com/cn/articles/5-consortium-blockchain-comparison) / [quick version](https://upload-images.jianshu.io/upload_images/11336404-f753396df0e930c8.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)    
+    -   [FISCO BCOS vs Fabric](http://www.infoq.com/cn/news/2018/09/uncover-consortium-blockchain)   
 
 *   **Implement a consortium blockchain using ethereum**  
--   [Building a Private Ethereum Consortium](https://www.microsoft.com/developerblog/2018/06/01/creating-private-ethereum-consortium-kubernetes/)
--   [Deploying a private Ethereum blockchain to Microsoft Azure Cloud](https://www.youtube.com/watch?v=HsConsFaZG8)
--   [Ethereum Consortium Network Deployments Made Easy](https://github.com/CatalystCode/ibera-ethereum-consortium-blockchain-network)
--   [How to Set Up a Private Ethereum Blockchain in 20 Minutes](https://arctouch.com/blog/how-to-set-up-ethereum-blockchain/)
+    -   [Building a Private Ethereum Consortium](https://www.microsoft.com/developerblog/2018/06/01/creating-private-ethereum-consortium-kubernetes/)
+    -   [Deploying a private Ethereum blockchain to Microsoft Azure Cloud](https://www.youtube.com/watch?v=HsConsFaZG8)
+    -   [Ethereum Consortium Network Deployments Made Easy](https://github.com/CatalystCode/ibera-ethereum-consortium-blockchain-network)
+    -   [How to Set Up a Private Ethereum Blockchain in 20 Minutes](https://arctouch.com/blog/how-to-set-up-ethereum-blockchain/)
 
 
 #### Fabric