diff --git a/beacon_node/beacon_chain/src/observed_blob_sidecars.rs b/beacon_node/beacon_chain/src/observed_blob_sidecars.rs
index 6c2f07ff59..f16f38bad5 100644
--- a/beacon_node/beacon_chain/src/observed_blob_sidecars.rs
+++ b/beacon_node/beacon_chain/src/observed_blob_sidecars.rs
@@ -87,7 +87,7 @@ impl<T: EthSpec> ObservedBlobSidecars<T> {
         Ok(())
     }
 
-    /// Prune all values earlier than the given slot.
+    /// Prune `blob_sidecar` observations for slots less than or equal to the given slot.
     pub fn prune(&mut self, finalized_slot: Slot) {
         if finalized_slot == 0 {
             return;