diff --git a/core/blockchain.go b/core/blockchain.go
index 712b057a91..15f9cbbc84 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -131,11 +131,11 @@ const (
 	// - Version 8
 	//  The following incompatible database changes were added:
 	//    * New scheme for contract code in order to separate the codes and trie nodes
-  //
+	//
 	// - Version 9
 	//    * Total difficulty has been removed from both the key-value store and the
-	//      ancient store, the td freezer table has been deprecated since that.
-  //    * The metadata structure of freezer is changed by adding 'flushOffset'
+	//      ancient store, the td freezer table has been deprecated.
+	//    * The metadata structure of freezer is changed by adding 'flushOffset'
 	BlockChainVersion uint64 = 9
 )