diff --git a/message/src/common/inventory.rs b/message/src/common/inventory.rs
index a28b9d61..fd618d75 100644
--- a/message/src/common/inventory.rs
+++ b/message/src/common/inventory.rs
@@ -32,7 +32,7 @@ impl From<InventoryType> for u32 {
 
 #[derive(Debug, PartialEq, Clone)]
 pub struct InventoryVector {
-	pub inv_type: u32,
+	pub inv_type: u32, // TODO: change to InventoryType as discussed in #37
 	pub hash: H256,
 }
 
diff --git a/sync/src/local_node.rs b/sync/src/local_node.rs
index ee5403c7..921a03cf 100644
--- a/sync/src/local_node.rs
+++ b/sync/src/local_node.rs
@@ -157,6 +157,8 @@ impl LocalNode {
 	}
 
 	fn execute_synchronization_task(&mut self, task: SynchronizationTask) {
+		// TODO: what is types::GetBlocks::version here? (@ PR#37)
+
 		match task {
 			SynchronizationTask::RequestBlocks(peer_index, blocks_hashes) => {
 				let getdata = types::GetData {
diff --git a/sync/src/synchronization.rs b/sync/src/synchronization.rs
index f8e5030a..5a43e4ef 100644
--- a/sync/src/synchronization.rs
+++ b/sync/src/synchronization.rs
@@ -13,7 +13,7 @@ use synchronization_peers::Peers;
 ///! 2) no forks support
 ///!
 ///! When new peer is connected:
-///! 1) send `getdata` message with full block locator hashes
+///! 1) send `inventory` message with full block locator hashes
 ///!
 ///! When `inventory` message is received from peer:
 ///! 1) if synchronization queue is empty:
@@ -33,7 +33,7 @@ use synchronization_peers::Peers;
 ///! 1) if any basic verification is failed (TODO):
 ///! 1.1) penalize peer
 ///! 1.2) stop
-///! 1) if not(remove block was not requested):
+///! 1) if not(remove block) [i.e. block was not requested]:
 ///! 1.1) ignore it (TODO: try to append to the chain)
 ///! 1.2) stop
 ///! 2) if this block is first block in the `requested_hashes`: