diff --git a/src/flag/flag.go b/src/flag/flag.go
index edde5282cf..358402345c 100644
--- a/src/flag/flag.go
+++ b/src/flag/flag.go
@@ -981,7 +981,8 @@ func commandLineUsage() {
 }
 
 // NewFlagSet returns a new, empty flag set with the specified name and
-// error handling property.
+// error handling property. If the name is not empty, it will be printed
+// in the default usage message and in error messages.
 func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet {
 	f := &FlagSet{
 		name:          name,