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@@ -191,7 +191,7 @@ We will have more practical examples of using Polygon in future modules.
 [Arbitrum](https://offchainlabs.com/) is an optimistic rollup solution for general purpose smart contracts on Ethereum. It is EVM-compatible, and developers can easily port their existing Solidity code to Arbitrum.
 
 #### Optimism
-[Optimism](https://www.optimism.io/) is also an optimistic rollup solution for general purpose smart contracts on Ethereum. It is also EVM-compatible, and develoeprs can port their existing Solidity code to Optimism.
+[Optimism](https://www.optimism.io/) is also an optimistic rollup solution for general purpose smart contracts on Ethereum. It is also EVM-compatible, and developers can port their existing Solidity code to Optimism.
 
 Arbitrum and Optimism differ in some low-level nitty-gritty technical details, but on the surface, they both operate within the same category.