diff --git a/reflect.go b/reflect.go
index dd52529..034501d 100644
--- a/reflect.go
+++ b/reflect.go
@@ -277,7 +277,7 @@ func (r *Reflector) reflectTypeToSchemaWithID(defs Definitions, t reflect.Type)
 func (r *Reflector) reflectTypeToSchema(definitions Definitions, t reflect.Type) (res *Schema) {
 	defer func() {
 		if r.NullableFromType && isNullable(t.Kind()) {
-			res.makeNullable()
+			res.MakeNullable()
 		}
 	}()
 
@@ -489,7 +489,7 @@ func (r *Reflector) reflectStructFields(st *Schema, definitions Definitions, t r
 	if t.Kind() == reflect.Pointer {
 		r.reflectStructFields(st, definitions, t.Elem())
 		if r.NullableFromType {
-			st.makeNullable()
+			st.MakeNullable()
 		}
 		return
 	}
@@ -534,8 +534,8 @@ func (r *Reflector) reflectStructFields(st *Schema, definitions Definitions, t r
 		}
 
 		unwrapped := property
-		if r.NullableFromType && unwrapped.isNullable() {
-			unwrapped = unwrapped.unwrapNullable()
+		if r.NullableFromType {
+			unwrapped = unwrapped.UnwrapNullable()
 		}
 		unwrapped.structKeywordsFromTags(f, st, name)
 		if unwrapped.Description == "" {
@@ -546,7 +546,7 @@ func (r *Reflector) reflectStructFields(st *Schema, definitions Definitions, t r
 		}
 
 		if nullable && !r.NullableFromType { // we already set the nullability if r.NullableFromType is set
-			property.makeNullable()
+			property.MakeNullable()
 		}
 
 		st.Properties.Set(name, property)
@@ -627,25 +627,6 @@ func (r *Reflector) lookupID(t reflect.Type) ID {
 	return EmptyID
 }
 
-func (t *Schema) makeNullable() {
-	sc := *t
-	*t = Schema{OneOf: []*Schema{&sc, {Type: "null"}}}
-}
-
-func (t *Schema) isNullable() bool {
-	return t.unwrapNullable() != nil
-}
-
-func (t *Schema) unwrapNullable() *Schema {
-	if t.Type != "" {
-		return nil
-	}
-	if len(t.OneOf) != 2 || t.OneOf[1].Type != "null" {
-		return nil
-	}
-	return t.OneOf[0]
-}
-
 func (t *Schema) structKeywordsFromTags(f reflect.StructField, parent *Schema, propertyName string) {
 	t.Description = f.Tag.Get("jsonschema_description")
 
diff --git a/schema.go b/schema.go
index 2d914b8..598dab2 100644
--- a/schema.go
+++ b/schema.go
@@ -88,6 +88,28 @@ var (
 	FalseSchema = &Schema{boolean: &[]bool{false}[0]}
 )
 
+// MakeNullable will replace the schema that either matches the schema or `null` value:
+// The resulting schema is wrapped via `oneOf` feature.
+//
+//	{"oneOf":[s,{"type":"null"}]}
+func (t *Schema) MakeNullable() {
+	sc := *t
+	*t = Schema{OneOf: []*Schema{&sc, {Type: "null"}}}
+}
+
+// IsNullable will test if the Schema is nullable in terms of MakeNullable
+func (t *Schema) IsNullable() bool {
+	return len(t.OneOf) == 2 && t.OneOf[1].Type == "null"
+}
+
+// UnwrapNullable will return the non-nullable schema part if the schema is nullable.
+func (t *Schema) UnwrapNullable() *Schema {
+	if t.IsNullable() {
+		return t.OneOf[0]
+	}
+	return t
+}
+
 // Definitions hold schema definitions.
 // http://json-schema.org/latest/json-schema-validation.html#rfc.section.5.26
 // RFC draft-wright-json-schema-validation-00, section 5.26