diff --git a/core/blockchain.go b/core/blockchain.go
index 134d8a304a..efccd113d2 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -807,7 +807,7 @@ func (bc *BlockChain) GasLimit() uint64 {
 }
 
 // CurrentBlock retrieves the current head block of the canonical chain. The
-// block is retrieved from the blockchain's internal cache.
+// block is retrieved from the blockchain's internal cache. aa
 func (bc *BlockChain) CurrentBlock() *types.Block {
 	return bc.currentBlock.Load().(*types.Block)
 }