diff --git a/MEV_and_trading/protocols/README.md b/MEV_and_trading/protocols/README.md
index 3a247f2..2fd5a29 100644
--- a/MEV_and_trading/protocols/README.md
+++ b/MEV_and_trading/protocols/README.md
@@ -15,6 +15,21 @@
 
 <br>
 
+----
+
+### basic definitions
+
+<br>
+
+* **protocol fees**: fees generated by users using a dapp as a form of income for the protocol
+* **supply-side fees**: the cost for the protocol (amount used for expenses)
+* **revenue**: protocol fees minus supply side fees
+* **token emissions**: value/cost of native tokens being inflated by the protocol (for instance, to attract users)
+* **earnings**: revenue minus token emissions (how much money the protocol has earned)
+
+<br>
+
+
 ----
 
 ### resources