explain fully synced

src/guides/parachain_deployment.md

@@ -241,7 +241,7 @@ parachain-template-node  --chain chainspec.raw.json --tmp
 * Connect to it with [Polkadot.js Apps](https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944) on `ws://127.0.0.1:9944`.
 * You can inspect the [chain state in Polkadot.js Apps](https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944#/chainstate) to verify that everything is in order for the launch.
 
-Note: if you look at the node logs, it should be starting to sync the relay-chain (Rococo in our case). You don’t have to wait until it is fully synced.
+Note: if you look at the node logs, it should be starting to sync the relay-chain (Rococo in our case). For this dry-run step, you don’t have to wait until it is fully synced. However, after deployment, a node needs to be fully synced in order to collate parachain blocks.
 
 ## Deploy your nodes