diff --git a/MEV_and_trading/lending/README.md b/MEV_and_trading/lending/README.md
index eaeadda..0277164 100644
--- a/MEV_and_trading/lending/README.md
+++ b/MEV_and_trading/lending/README.md
@@ -28,4 +28,5 @@
 
 <br>
 
+* [survey of defi lending](https://timroughgarden.github.io/fob21/reports/r5.pdf)
 * [leveraged lending, by defillama](https://defillama.com/yields/loop)