diff --git a/option.go b/option.go
index 60225dd..c8ec1b3 100644
--- a/option.go
+++ b/option.go
@@ -8,18 +8,21 @@ import (
 type EncodeOption = encoder.Option
 type EncodeOptionFunc func(*EncodeOption)
 
+// UnorderedMap doesn't sort when encoding map type.
 func UnorderedMap() EncodeOptionFunc {
 	return func(opt *EncodeOption) {
 		opt.Flag |= encoder.UnorderedMapOption
 	}
 }
 
+// Debug outputs debug information when panic occurs during encoding.
 func Debug() EncodeOptionFunc {
 	return func(opt *EncodeOption) {
 		opt.Flag |= encoder.DebugOption
 	}
 }
 
+// Colorize add an identifier for coloring to the string of the encoded result.
 func Colorize(scheme *ColorScheme) EncodeOptionFunc {
 	return func(opt *EncodeOption) {
 		opt.Flag |= encoder.ColorizeOption
@@ -30,6 +33,12 @@ func Colorize(scheme *ColorScheme) EncodeOptionFunc {
 type DecodeOption = decoder.Option
 type DecodeOptionFunc func(*DecodeOption)
 
+// DecodeFieldPriorityFirstWin
+// in the default behavior, go-json, like encoding/json,
+// will reflect the result of the last evaluation when a field with the same name exists.
+// This option allow you to change this behavior.
+// this option reflects the result of the first evaluation if a field with the same name exists.
+// This behavior has a performance advantage as it allows the subsequent strings to be skipped if all fields have been evaluated.
 func DecodeFieldPriorityFirstWin() DecodeOptionFunc {
 	return func(opt *DecodeOption) {
 		opt.Flag |= decoder.FirstWinOption