Merge pull request #1053 from richardgreg/gas-limit-discoverability

Improve discoverability for gas limit

Author: krofax

pages/stack/transactions/fees.mdx

@@ -6,6 +6,13 @@ description: Learn how transaction fees work on OP Mainnet.
 
 import { Callout } from 'nextra/components'
 
+<Callout>
+  The OP Stack maintains a distinct gas limit compared to the Ethereum mainnet.
+  While both chains use the same underlying transaction formats, Optimism's gas limits are tailored for optimal Layer 2 performance and scalability.
+  As a result, transactions on Optimism may behave differently from the mainnet regarding gas usage and fee estimation.
+  For a detailed comparison of gas limits between Optimism and Ethereum, see the [Optimism Chain Differences documentation](https://docs.optimism.io/chain/differences#transaction-fees).
+</Callout>
+
 # Transaction fees on OP Mainnet
 
 OP Mainnet is designed to be [EVM equivalent](https://web.archive.org/web/20231127160757/https://medium.com/ethereum-optimism/introducing-evm-equivalence-5c2021deb306), which means it reuses the same Ethereum code you're already familiar with and behaves as much like Ethereum as possible.