diff --git a/docs/code_contribution_guidelines.md b/docs/code_contribution_guidelines.md
index c86de036c..dca65e670 100644
--- a/docs/code_contribution_guidelines.md
+++ b/docs/code_contribution_guidelines.md
@@ -85,7 +85,7 @@ security and performance implications.
   foundation to build on will make the code much more comprehensible.
 - [Lightning Network Whitepaper](https://lightning.network/lightning-network-paper.pdf) - This is the white paper that kicked off the Layer 2 revolution. Having a good grasp of the concepts of Lightning will make the core logic within the daemon much more comprehensible: Bitcoin Script, off-chain blockchain protocols, payment channels, bi-directional payment channels, relative and absolute time-locks, commitment state revocations, and Segregated Witness. 
     - The original LN was written for a rather narrow audience, the paper may be a bit unapproachable to many. Thanks to the Bitcoin community, there exist many easily accessible supplemental resources which can help one see how all the pieces fit together from double-spend protection all the way up to commitment state transitions and Hash Time Locked Contracts (HTLCs): 
-         - [Lightning Network Summary](https://lightning.network/lightning-network-summary.pdf)
+        - [Lightning Network Summary](https://lightning.network/lightning-network-summary.pdf)
         - [Understanding the Lightning Network 3-Part series](https://bitcoinmagazine.com/articles/understanding-the-lightning-network-part-building-a-bidirectional-payment-channel-1464710791) 
         - [Deployable Lightning](https://github.com/ElementsProject/lightning/blob/master/doc/deployable-lightning.pdf)