Update README.md

lightning-li · Jul 20, 2022 · e7ec0f5 · e7ec0f5
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@@ -4,7 +4,7 @@ zkEVM Node is a Go implementation of a node that operates the Polygon zkEVM Netw
 
 ## About the Polygon zkEVM network
 
-Since this is an implementation of a protocol it's fundamental to understand it, [here](TODO) you can find the specification of the protocol.
+Since this is an implementation of a protocol it's fundamental to understand it, [here](https://docs.hermez.io/) you can find the specification of the protocol.
 
 Glossary: