diff --git a/core/rawdb/eradb/eradb.go b/core/rawdb/eradb/eradb.go
index ae19016cc6..6236640842 100644
--- a/core/rawdb/eradb/eradb.go
+++ b/core/rawdb/eradb/eradb.go
@@ -55,8 +55,6 @@ func New(datadir string) (*EraDatabase, error) {
 		return nil, err
 	}
 	db := &EraDatabase{datadir: datadir, cache: lru.NewCache[uint64, *era.Era](openFileLimit)}
-	// Take care to close era1 files when they are evicted or replaced
-	// in the cache to avoid leaking file descriptors.
 	closeEra := func(epoch uint64, e *era.Era) {
 		if e == nil {
 			log.Warn("Era1 cache contained nil value", "epoch", epoch)
@@ -67,7 +65,10 @@ func New(datadir string) (*EraDatabase, error) {
 		}
 
 	}
+	// Take care to close era1 files when they are evicted from cache.
 	db.cache.OnEvicted(closeEra)
+	// Concurrently calling GetRaw* methods can cause the same era1 file to be
+	// opened multiple times.
 	db.cache.OnReplaced(closeEra)
 	log.Info("Opened erastore", "datadir", datadir)
 	return db, nil