diff --git a/buffered.go b/buffered.go
index 5fc6dac..8eed164 100644
--- a/buffered.go
+++ b/buffered.go
@@ -11,16 +11,17 @@ import (
 // NewBuffered creates a new Buffered client.
 // Options may be one of the following:
 //
-//   * fluent.WithAddress
-//   * fluent.WithBufferLimit
-//   * fluent.WithDialTimeout
-//   * fluent.WithJSONMarshaler
-//   * fluent.WithMaxConnAttempts
-//   * fluent.WithMsgpackMarshaler
-//   * fluent.WithNetwork
-//   * fluent.WithTagPrefix
-//   * fluent.WithWriteThreshold
-//   * fluent.WithWriteQueueSize
+//   - fluent.WithAddress
+//   - fluent.WithBufferLimit
+//   - fluent.WithDialTimeout
+//   - fluent.WithJSONMarshaler
+//   - fluent.WithMaxConnAttempts
+//   - fluent.WithMsgpackMarshaler
+//   - fluent.WithMarshaller
+//   - fluent.WithNetwork
+//   - fluent.WithTagPrefix
+//   - fluent.WithWriteThreshold
+//   - fluent.WithWriteQueueSize
 //
 // Please see their respective documentation for details.
 func NewBuffered(options ...Option) (client *Buffered, err error) {
@@ -62,17 +63,16 @@ func NewBuffered(options ...Option) (client *Buffered, err error) {
 // If you would like to specify options to `Post()`, you may pass them at the end of
 // the method. Currently you can use the following:
 //
-//   fluent.WithContext: specify context.Context to use
-//   fluent.WithTimestamp: allows you to set arbitrary timestamp values
-//   fluent.WithSyncAppend: allows you to verify if the append was successful
+//	fluent.WithContext: specify context.Context to use
+//	fluent.WithTimestamp: allows you to set arbitrary timestamp values
+//	fluent.WithSyncAppend: allows you to verify if the append was successful
 //
 // If fluent.WithSyncAppend is provide and is true, the following errors
 // may be returned:
 //
-//   1. If the current underlying pending buffer is is not large enough to
-//      hold this new data, an error will be returned
-//   2. If the marshaling into msgpack/json failed, it is returned
-//
+//  1. If the current underlying pending buffer is is not large enough to
+//     hold this new data, an error will be returned
+//  2. If the marshaling into msgpack/json failed, it is returned
 func (c *Buffered) Post(tag string, v interface{}, options ...Option) (err error) {
 	if pdebug.Enabled {
 		g := pdebug.Marker("fluent.Buffered.Post").BindError(&err)
diff --git a/options.go b/options.go
index 7b8c383..12fd3cf 100644
--- a/options.go
+++ b/options.go
@@ -56,6 +56,12 @@ func WithJSONMarshaler() Option {
 	return option.New(identMarshaler{}, marshalFunc(jsonMarshal))
 }
 
+// WithMarshaller specifies a custom marshaling to be used when
+// sending messages to fluentd. Used for `fluent.New`
+func WithMarshaller(m marshaler) Option {
+	return option.New(identMarshaler{}, m)
+}
+
 // WithMsgpackMarshaler specifies msgpack marshaling to be used when
 // sending messages to fluentd. Used in `fluent.New`
 func WithMsgpackMarshaler() Option {