Merge pull request #1145 from ethereum-optimism/zainbacchus-patch-3

Add clarification re L1Admin

Author: krofax

pages/stack/interop/explainer.mdx

@@ -40,7 +40,7 @@ This gives the OP Stack an unopinionated and flexible foundation, so chain opera
 ## Superchain interop cluster
 The Superchain builds on top of the interop protocol and implements a single mesh network with complete dependencies. In this model, each blockchain in the Superchain interop cluster would have direct connections to every other blockchain, creating a fully connected mesh network. Compared to a hub and spoke model, this provides the highest level of interoperability, as any blockchain can transact directly with any other.
 
-Each blockchain that is part of the Superchain interop cluster will have the same security model to mitigate the weakest-link scenario and will be managed by Optimism Governance. 
+Each blockchain in the Superchain interop cluster shares the same security model to mitigate the weakest-link scenario. As outlined in the [Standard Rollup Charter](https://gov.optimism.io/t/season-6-standard-rollup-charter-ratification/8135#p-36758-governing-policies-11), these chains share the same L1 `ProxyAdmin` Owner. Any changes to the Superchain interop cluster must follow the standard Protocol Upgrade vote procedure—the established governance process for Superchain modifications.
 
 
 ## New predeploys