diff --git a/state/block_cache.go b/state/block_cache.go
index 74f6c2f82..3198c3b95 100644
--- a/state/block_cache.go
+++ b/state/block_cache.go
@@ -23,6 +23,7 @@ func makeStorage(db dbm.DB, root []byte) merkle.Tree {
 	return storage
 }
 
+// The blockcache helps prevent unnecessary IAVLTree updates and garbage generation.
 type BlockCache struct {
 	db       dbm.DB
 	backend  *State
diff --git a/state/tx_cache.go b/state/tx_cache.go
index 71d72cc93..b4afcc9dd 100644
--- a/state/tx_cache.go
+++ b/state/tx_cache.go
@@ -134,8 +134,6 @@ func (cache *TxCache) Sync() {
 			cache.backend.UpdateAccount(toStateAccount(acc))
 		}
 	}
-
-	// TODO support logs, add them to the cache somehow.
 }
 
 func (cache *TxCache) AddLog(log *vm.Log) {