diff --git a/nomos-da/kzgrs/src/common.rs b/nomos-da/kzgrs/src/common.rs
index 918102aa..c0ac5623 100644
--- a/nomos-da/kzgrs/src/common.rs
+++ b/nomos-da/kzgrs/src/common.rs
@@ -21,6 +21,8 @@ pub enum KzgRsError {
     ChunkSizeTooBig(usize),
 }
 
+/// Transform chunks of bytes (of size `CHUNK_SIZE`) into `Fr` which are considered evaluations of a
+/// polynomial.
 fn bytes_to_evaluations<const CHUNK_SIZE: usize>(
     data: &[u8],
     domain: GeneralEvaluationDomain<Fr>,
@@ -41,6 +43,10 @@ fn bytes_to_evaluations<const CHUNK_SIZE: usize>(
     )
 }
 
+/// Transform chunks of bytes (of size `CHUNK_SIZE`) into `Fr` which are considered evaluations of a
+/// polynomial. Then use FFT to transform that polynomial into coefficient form.
+/// `CHUNK_SIZE` needs to be 31 (bytes) or less, otherwise it cannot be encoded.
+/// The input data need to be padded, so it fits in a len modulus of `CHUNK_SIZE`.
 pub fn bytes_to_polynomial<const CHUNK_SIZE: usize>(
     data: &[u8],
     domain: GeneralEvaluationDomain<Fr>,