diff --git a/chain/beacon/drand/drand.go b/chain/beacon/drand/drand.go
index 6487ee11886..b5f5917ef74 100644
--- a/chain/beacon/drand/drand.go
+++ b/chain/beacon/drand/drand.go
@@ -53,6 +53,9 @@ type DrandBeacon struct {
 	localCache *lru.Cache[uint64, *types.BeaconEntry]
 }
 
+// IsChained tells us whether this particular beacon operates in "chained mode". Prior to Drand
+// quicknet, beacons form a chain. After the introduction of quicknet, they do not, so we need to
+// change how we interact with beacon entries. (See FIP-0063)
 func (db *DrandBeacon) IsChained() bool {
 	return db.isChained
 }
diff --git a/node/modules/dtypes/beacon.go b/node/modules/dtypes/beacon.go
index 020ad369891..91dd5cf57f9 100644
--- a/node/modules/dtypes/beacon.go
+++ b/node/modules/dtypes/beacon.go
@@ -13,5 +13,5 @@ type DrandConfig struct {
 	Servers       []string
 	Relays        []string
 	ChainInfoJSON string
-	IsChained     bool
+	IsChained     bool // Prior to Drand quicknet, beacons form a chain, post quicknet they do not (FIP-0063)
 }