diff --git a/specs/phase0/p2p-interface.md b/specs/phase0/p2p-interface.md
index a994b0c66..e98070b6f 100644
--- a/specs/phase0/p2p-interface.md
+++ b/specs/phase0/p2p-interface.md
@@ -468,9 +468,9 @@ The fields are, as seen by the client at the time of sending the message:
 - `fork_digest`: The node's `ForkDigest` (`compute_fork_digest(current_fork_version, genesis_validators_root)`) where
     - `current_fork_version` is the fork version at the node's current epoch defined by the wall-clock time (not necessarily the epoch to which the node is sync)
     - `genesis_validators_root` is the static `Root` found in `state.genesis_validators_root`
-- `finalized_root`: `state.finalized_checkpoint.root` for the state corresponding to the head block.
+- `finalized_root`: `state.finalized_checkpoint.root` for the state corresponding to the head block (Note this defaults to `Root(b'\x00' * 32)` for the genesis finalized checkpoint).
 - `finalized_epoch`: `state.finalized_checkpoint.epoch` for the state corresponding to the head block.
-- `head_root`: The hash_tree_root root of the current head block.
+- `head_root`: The `hash_tree_root` root of the current head block (`BeaconBlock`).
 - `head_slot`: The slot of the block corresponding to the `head_root`.
 
 The dialing client MUST send a `Status` request upon connection.