diff --git a/les/backend.go b/les/backend.go
index bc4d0f21d..f0f8a6a6e 100644
--- a/les/backend.go
+++ b/les/backend.go
@@ -193,12 +193,12 @@ type LightDummyAPI struct{}
 
 // Etherbase is the address that mining rewards will be send to
 func (s *LightDummyAPI) Etherbase() (common.Address, error) {
-	return common.Address{}, fmt.Errorf("not supported")
+	return common.Address{}, fmt.Errorf("mining is not supported in light mode")
 }
 
 // Coinbase is the address that mining rewards will be send to (alias for Etherbase)
 func (s *LightDummyAPI) Coinbase() (common.Address, error) {
-	return common.Address{}, fmt.Errorf("not supported")
+	return common.Address{}, fmt.Errorf("mining is not supported in light mode")
 }
 
 // Hashrate returns the POW hashrate