diff --git a/x/observer/keeper/msg_server_add_block_header.go b/x/observer/keeper/msg_server_add_block_header.go
index 35ea50f08e..1f93660063 100644
--- a/x/observer/keeper/msg_server_add_block_header.go
+++ b/x/observer/keeper/msg_server_add_block_header.go
@@ -39,6 +39,11 @@ func (k msgServer) AddBlockHeader(goCtx context.Context, msg *types.MsgAddBlockH
 		return nil, cosmoserrors.Wrap(types.ErrBlockAlreadyExist, fmt.Sprintf("block hash: %x", msg.BlockHash))
 	}
 
+	// if parent block header is not found, this tx is rejected
+	// if no BlockHeaderState is found, allow this vote to pass through to create and initialize
+	// the Earliest/Latest height with this block header (after voting, not here)
+	// if BlockHeaderState is found, check if the block height is valid
+	// validate block height as it's not part of the header itself
 	bhs, found := k.Keeper.GetBlockHeaderState(ctx, msg.ChainId)
 	if found && bhs.EarliestHeight > 0 && bhs.EarliestHeight < msg.Height {
 		pHash, err := msg.Header.ParentHash()