diff --git a/ethdb/database.go b/ethdb/database.go
index c14eea198c..8c6f68ddbb 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -130,12 +130,10 @@ type AncientWriter interface {
 	// will be removed all together.
 	TruncateTail(n uint64) (uint64, error)
 
-	// TruncateTailBlocks discards the first n ancient data from the ancient store. The already
-	// deleted items are ignored. After the truncation, the earliest item can be accessed
-	// is item_n(start from 0). The deleted items may not be removed from the ancient store
-	// immediately, but only when the accumulated deleted data reach the threshold then
-	// will be removed all together. Only deletes bodies and receipts.
-	TruncateTailBlocks(n uint64) (uint64, error)
+	// TruncateTailBlocks discards all blocks and receipts below the given number from the
+	// ancient store. Headers are left as-is. This is intended to be used with the chain
+	// freezer specifically.
+	TruncateTailBlocks(tailBlock uint64) (uint64, error)
 
 	// Sync flushes all in-memory ancient store data to disk.
 	Sync() error