diff --git a/beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs b/beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs
index eaea2f70da8..7f083139ee2 100644
--- a/beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs
+++ b/beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs
@@ -26,6 +26,15 @@ use types::{
 ///
 /// The blobs are all gossip and kzg verified.
 /// The block has completed all verifications except the availability check.
+///
+/// There are currently three distinct hardfork eras that one should take note of:
+///     - Pre-Deneb: No availability requirements (Block is immediately available)
+///     - Post-Deneb, Pre-PeerDAS: Blobs are needed, but columns are not for the availability check
+///     - Post-PeerDAS: Columns are needed, but blobs are not for the availability check
+///
+/// Note: from this, one can immediately see that `verified_blobs` and `verified_data_columns`
+/// are mutually exclusive. i.e. If we are verifying columns to determine a block's availability
+/// we are ignoring the `verified_blobs` field.
 pub struct PendingComponents<E: EthSpec> {
     pub block_root: Hash256,
     pub verified_blobs: RuntimeFixedVector<Option<KzgVerifiedBlob<E>>>,