diff --git a/readme.md b/readme.md
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@@ -116,7 +116,7 @@ Decentralized finance (#defi) is the movement that leverages open source softwar
 ## Tokenization Protocols
 - Ethereum
   - [Harbor/R-Token](https://harbor.com) ([source code](https://github.com/harborhq), [white paper](https://harbor.com/rtokenwhitepaper.pdf)) - Compliant protocol for standardizing crypto-securities issuance and trading
-  - [Polymath/ST-20](https://polymath.network) ([source code](https://github.com/PolymathNetwork), [white paper](https://polymath.network/whitepaper.html)) - Platform for tokenizing securities
+  - [Polymath/ST-20](https://polymath.network) ([source code](https://github.com/PolymathNetwork), original white paper removed from website but is archived [here](https://whitepaper.io/document/57/polymath-whitepaper)) - Platform for tokenizing securities
   - [Abacus](https://abacusprotocol.com) ([soure code](https://github.com/abacusfi), [white paper](https://github.com/abacusfi/whitepaper/blob/master/whitepaper.pdf) - Protocol for permissioned tokens
 
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