diff --git a/MEV_searchers/order_flows/exclusive_order_flows.md b/MEV_searchers/order_flows/exclusive_order_flows.md
index 02b713c..3eb1a8c 100644
--- a/MEV_searchers/order_flows/exclusive_order_flows.md
+++ b/MEV_searchers/order_flows/exclusive_order_flows.md
@@ -1,4 +1,4 @@
-##  exclusive order flows 
+##  exclusive/private order flows 
 
 <br>
 
@@ -12,20 +12,41 @@
 
 <br>
 
+#### types of private order flows
 
+<br>
+<center>
+<img width="500" src="https://user-images.githubusercontent.com/1130416/217937850-9b7e9434-ee72-4c2a-9e5e-ae9fe795310e.png">
+</center>
+<br>
+
+##### rpc-based "payment for order flow protocols" (POFPs)
+
+* this type of private order flows can be realized by modifying either the user's rpc or by modifying the protocol's frontend
+* the rpc endpoint re-broadcasts (forwarding) the tx to nodes. 
+* in respect to every pending tx they receive, they can: 1) censor, 2) forward to some mempool, or 3) forward it directly to some block-builders or validators.
+
+<br>
+
+##### validator transaction reordering protocols (VTRPs)
+
+* private tx reordering
+* two goals: 1) identify valuable user txs, 2) replace the POFP's value-extracted tx with its own value-extractive tx
+* when a VTRP is able to identify a valuable user tx but, due to the tactics of the POFP, is unable to inject its own transaction in place of the POFP's -> VTRP's optimal strategy is to censor the user's transaction from the final block
+
+<br>
 
 ---
 
-### resources
+### cool resources
 
 <br>
 
 
-* [private order flow and the block builder market, by jon charbonneau](https://twitter.com/jon_charb/status/1562916372505665536)
-* [ethereum's biggest issue no one's talking about](https://mariusvanderwijden.github.io/blog/2022/10/21/lightclients/)
-* [private order flow is the new MEV (youtube)](https://www.youtube.com/watch?v=bapIqxhIdaY)
-* [order flow, auctions and centralisation II: order flow auctions](https://collective.flashbots.net/t/order-flow-auctions-and-centralisation-ii-order-flow-auctions/284)
-* [order flow, auctions & centralisation, by q. kilbourn](https://www.youtube.com/watch?v=ilc3EoSMMDg)
-* [order flow auctions & enshrined builder, by apriori](https://mirror.xyz/apriori.eth/wiLKgkaN6JBwBDq4E3T_-BZ0OIPhlbIItgJdE3CFAMo)
-* [payment for order flow on tradefi, by forbes](https://www.forbes.com/advisor/investing/payment-for-order-flow/)
-* [the orderflow auction design space, by frontier](https://frontier.tech/the-orderflow-auction-design-space)
+* **[the orderflow auction design space, by frontier (2023)](https://frontier.tech/the-orderflow-auction-design-space)**
+* **[private order flow and the block builder market, by j. charbonneau (2022)](https://twitter.com/jon_charb/status/1562916372505665536)**
+* **[ethereum's biggest issue no one's talking about, by mvd wijden (2022)](https://mariusvanderwijden.github.io/blog/2022/10/21/lightclients/)**
+* **[private order flow is the new mev (video), by empire (2022)](https://www.youtube.com/watch?v=bapIqxhIdaY)**
+* **[order flow, auctions and centralisation II: order flow auctions, by quintus (2022)](https://collective.flashbots.net/t/order-flow-auctions-and-centralisation-ii-order-flow-auctions/284)**
+* **[order flow auctions & enshrined builder, by apriori (2022)](https://mirror.xyz/apriori.eth/wiLKgkaN6JBwBDq4E3T_-BZ0OIPhlbIItgJdE3CFAMo)**
+