Update README.md

Author: robertagora

basics/what-is-filecoin/README.md

@@ -11,7 +11,7 @@ Filecoin is a peer-to-peer network that enables reliable, decentralized file sto
 
 Anyone can join Filecoin as a client looking to store their data, or as a storage provider offering storage services. Storage availability and pricing aren’t controlled by any single entity; instead, Filecoin fosters an open market for file storage and retrieval accessible to all.  Clients can review the history of each storage provider, along with their credentials and compliance record, before choosing to store their data with them.
 
-Note that most Filecoin nodes are [IPFS protocol](https://docs.ipfs.tech/) nodes.  IPFS is a open system, a hypermedia protocol, to manage data without a central server that makes use of [content addressing](https://docs.ipfs.tech/concepts/content-addressing/) to provide permanent data references without dependency on specific devices or cloud providers.  A client who knows the content address (CID) of their file can retrieve it from any IPFS node (or Filecoin storage provider) that currently has a copy and is able to serve it.  
+Note that most Filecoin nodes are [IPFS protocol](https://docs.ipfs.tech/) nodes.  IPFS is a open system, a hypermedia protocol, to manage data without a central server that makes use of [content addressing](https://docs.ipfs.tech/concepts/content-addressing/) to provide permanent data references without dependency on specific devices or cloud providers.  A client who knows the content address (CID) of their file can retrieve it from any IPFS node (or Filecoin storage provider) that currently has a copy and is able to serve it.  Given a CID, the [CID Contact](https://cid.contact/) network indexer will locate and providing routing details for the relevant file.   
 
 Historically, IPFS node operators offered pinning services to the community out of interest and often for free, meaning there was no financial incentive for the IPFS node operators to stay online or keep a given file for a long period of time.  Filecoin solves this issue by introducing an incentive layer (clients pay storage providers for long term data center use) to ensure more reliable long term cold storage.  Since most Filecoin nodes are also IPFS nodes, they can pin a hot copy of the given file to the IPFS node to allow the client to easily retrieve the file later.