Update README.md

README.md

@@ -10,16 +10,16 @@ Converting (scoped)enum values to/from string names written in C++>=11.
 * Supports `enum` and `enum class`
 * Supports enums in namespaces, classes or structs even templated or not
 * Supports compile-time as much as possible using with C++14 and later
-* Changing enum range with template parameter <sub>(default range: `[-128, 128)`)</sub> on each call or with your special function for types or adding specialized enum_range<Enum> struct
+* Changing enum range with template parameter <sub>(default range: `[-128, 128)`)</sub> on each call or with your special function for types or adding specialized `enum_range<Enum>` struct
 * Supports `operator<<` for direct using with ostream objects
-* Supports basic `flat_map` when using to_enum with range >= 10 instead of linear search
+* Supports custom enum name output by explicit specialization of `constexpr inline auto mgutility::detail::enum_type::name<Enum, EnumValue>() noexcept` function
 
 ## Limitations
 * Compiler versions
 * Wider range can increase compile time so user responsible to adjusting for enum's range
 
 
-## Usage ([try it!](https://godbolt.org/z/cKsEo353T))
+## Usage ([try it!](https://godbolt.org/z/8Ye1PhKhs))
 ```C++
 #include <iostream>
 #include "enum_name.hpp"
@@ -29,6 +29,12 @@ enum class rgb_color { red, green, blue, unknown = -1};
 
 // you can specialize enum ranges with specialize struct per enum types (option 1)
 namespace mgutility{
+    namespace detail{
+        // specialize rgb_color::unknown to make output "UNKNOWN"
+        template <>
+        constexpr inline auto enum_type::name<rgb_color, rgb_color::unknown>() noexcept -> string_view { return "UNKNOWN"; }
+    }
+
     template<>
     struct enum_range<rgb_color>
     {