diff --git a/eth/config.go b/eth/config.go
index de43df3183..80ae07a92f 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -30,6 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 )
 
+// DefaultConfig contains default settings for use on the Ethereum main net.
 var DefaultConfig = Config{
 	EthashCachesInMem:    2,
 	EthashCachesOnDisk:   3,