diff --git a/MEV_by_chains/MEV_on_Optimism/README.md b/MEV_by_chains/MEV_on_Optimism/README.md
index 5482017..2f87cb2 100644
--- a/MEV_by_chains/MEV_on_Optimism/README.md
+++ b/MEV_by_chains/MEV_on_Optimism/README.md
@@ -10,6 +10,8 @@
 <br>
 
 
+---
+
 ### in this dir
 
 <br>