Add a FIXME.

mpcs/src/basefold/encoding/basecode.rs

@@ -237,6 +237,8 @@ fn encode_field_type_rs_basecode<E: ExtensionField>(
 }
 
 // Split the input into chunks of message size, encode each message, and return the codewords
+// FIXME: It is expensive for now because it is using naive FFT (although it is
+// over a small domain)
 fn get_basecode<F: Field>(poly: &Vec<F>, rate: usize, message_size: usize) -> Vec<Vec<F>> {
     let timer = start_timer!(|| "Encode basecode");
     // The domain is just counting 1, 2, 3, ... , domain_size