Add link to pflag.WithFlagSet doc

README.md

@@ -165,7 +165,7 @@ There are providers for the following configuration sources.
 | [`secretmanager`](provider/secretmanager) | [GCP Secret Manager](https://cloud.google.com/security/products/secret-manager)         |       ✓       | [pubsub](notifier/pubsub) |
 | [`gcs`](provider/gcs)                     | [GCP Cloud Storage](https://cloud.google.com/storage)                                   |       ✓       | [pubsub](notifier/pubsub) |
 
-[cobra](https://github.com/spf13/cobra) is supported through the [`pflag`](provider/pflag) loader, with the `WithFlagSet` option:  
+[cobra](https://github.com/spf13/cobra) is supported through the [`pflag`](provider/pflag) loader, with the [`pflag.WithFlagSet`](https://pkg.go.dev/github.com/nil-go/konf/provider/pflag#WithFlagSet) option:  
 ```go
 config.Load(kflag.New(&config, kflag.WithFlagSet(yourCobraCmd.Flags())))
 ```