diff --git a/README.md b/README.md
index 8cb729f..23fb249 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,6 @@ Fast JSON encoder/decoder compatible with encoding/json for Go
 
 We are accepting requests for features that will be implemented between v0.8.0 and v.1.0.0.
 If you have the API you need, please submit your issue [here](https://github.com/goccy/go-json/issues).
-For example, I'm thinking of supporting `context.Context` of `json.Marshaler` and decoding using JSON Path.
 
 # Features
 
@@ -32,6 +31,7 @@ For example, I'm thinking of supporting `context.Context` of `json.Marshaler` an
 - Flexible customization with options
 - Coloring the encoded string
 - Can propagate context.Context to `MarshalJSON` or `UnmarshalJSON`
+- Can dynamically filter the fields of the structure type-safely
 
 # Installation
 
diff --git a/query.go b/query.go
index 137e663..4b11cf2 100644
--- a/query.go
+++ b/query.go
@@ -5,15 +5,25 @@ import (
 )
 
 type (
+	// FieldQuery you can dynamically filter the fields in the structure by creating a FieldQuery,
+	// adding it to context.Context using SetFieldQueryToContext and then passing it to MarshalContext.
+	// This is a type-safe operation, so it is faster than filtering using map[string]interface{}.
 	FieldQuery       = encoder.FieldQuery
 	FieldQueryString = encoder.FieldQueryString
 )
 
 var (
-	FieldQueryFromContext  = encoder.FieldQueryFromContext
+	// FieldQueryFromContext get current FieldQuery from context.Context.
+	FieldQueryFromContext = encoder.FieldQueryFromContext
+	// SetFieldQueryToContext set current FieldQuery to context.Context.
 	SetFieldQueryToContext = encoder.SetFieldQueryToContext
 )
 
+// BuildFieldQuery builds FieldQuery by fieldName or sub field query.
+// First, specify the field name that you want to keep in structure type.
+// If the field you want to keep is a structure type, by creating a sub field query using BuildSubFieldQuery,
+// you can select the fields you want to keep in the structure.
+// This description can be written recursively.
 func BuildFieldQuery(fields ...FieldQueryString) (*FieldQuery, error) {
 	query, err := Marshal(fields)
 	if err != nil {
@@ -22,6 +32,7 @@ func BuildFieldQuery(fields ...FieldQueryString) (*FieldQuery, error) {
 	return FieldQueryString(query).Build()
 }
 
+// BuildSubFieldQuery builds sub field query.
 func BuildSubFieldQuery(name string) *SubFieldQuery {
 	return &SubFieldQuery{name: name}
 }