diff --git a/arbitrum-docs/launch-orbit-chain/how-tos/set-up-aep-fee-router.mdx b/arbitrum-docs/launch-orbit-chain/how-tos/set-up-aep-fee-router.mdx
index ab69abe1e..3ab9ad982 100644
--- a/arbitrum-docs/launch-orbit-chain/how-tos/set-up-aep-fee-router.mdx
+++ b/arbitrum-docs/launch-orbit-chain/how-tos/set-up-aep-fee-router.mdx
@@ -143,6 +143,7 @@ TODO, we don't have a script for this yet
 3. Periodically redeem withdrawals on the parent chain
 
 ```shell
+# add --opStack if the router is on an OP stack chain
 yarn redeem-child-to-parent \
   --parentRPCUrl <parent_rpc_url> \
   --childRPCUrl <child_rpc_url> \