diff --git a/MEV_and_trading/derivatives/README.md b/MEV_and_trading/derivatives/README.md
index d21145e..18fc337 100644
--- a/MEV_and_trading/derivatives/README.md
+++ b/MEV_and_trading/derivatives/README.md
@@ -101,5 +101,6 @@
 
 * [defi derivative landscape](https://github.com/0xperp/defi-derivatives)
 * [put-call parity](https://www.investopedia.com/terms/p/putcallparity.asp#:~:text=Understanding%20Put%2DCall%20Parity,-As%20noted%20above&text=Put%2Dcall%20parity%20states%20that,to%20the%20option's%20strike%20price.)
+* [perpetual swaps, by laevitas](https://app.laevitas.ch/altsderivs/GMX/perpetualswaps)