Respond to further discussion.

Author: arik-so

lightning/src/routing/network_graph.rs

@@ -124,6 +124,7 @@ impl Readable for NodeId {
 /// Represents the network as nodes and channels between them
 pub struct NetworkGraph {
 	/// The timestamp provided by the most recent rapid gossip sync
+	/// It will be set by the rapid sync process after every sync completion
 	pub last_rapid_gossip_sync_timestamp: Option<u32>,
 	genesis_hash: BlockHash,
 	// Lock order: channels -> nodes