diff --git a/libraries/Complex/CHANGELOG.md b/libraries/Complex/CHANGELOG.md
index 7cf12191..56e27666 100644
--- a/libraries/Complex/CHANGELOG.md
+++ b/libraries/Complex/CHANGELOG.md
@@ -6,12 +6,15 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.3.3] - 2023-10-18
+- update readme.md
+
+
 ## [0.3.2] - 2022-10-29
 - add changelog.md
 - add rp2040 to build-CI
 - minor edit unit test
 
-
 ## [0.3.1] - 2021-12-14
 - update library.json
 - update license
diff --git a/libraries/Complex/README.md b/libraries/Complex/README.md
index d517ae11..c005b157 100644
--- a/libraries/Complex/README.md
+++ b/libraries/Complex/README.md
@@ -2,8 +2,11 @@
 [![Arduino CI](https://github.com/RobTillaart/Complex/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
 [![Arduino-lint](https://github.com/RobTillaart/Complex/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/Complex/actions/workflows/arduino-lint.yml)
 [![JSON check](https://github.com/RobTillaart/Complex/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/Complex/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/Complex.svg)](https://github.com/RobTillaart/Complex/issues)
+
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/Complex/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/Complex.svg?maxAge=3600)](https://github.com/RobTillaart/Complex/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/Complex.svg)](https://registry.platformio.org/libraries/robtillaart/Complex)
 
 
 # Complex
@@ -23,6 +26,10 @@ in any stream e.g. Serial.
 
 ## Interface
 
+```cpp
+#include "Complex.h"
+```
+
 See Complex.h for a full list of functions implemented.
 
 The library uses **float** for the real and imaginary part so precision is limited.
@@ -58,9 +65,31 @@ so it won't include the Complex.h file. Problem seen on Due and Teensy3.5
 
 ## Future
 
+#### Must
+
+- improve documentation
+
+#### Should
+
+#### Could
+
 - create a (8 byte) double based variant for high precision e.g. Complex8()  
-Note that some platforms map double to float, others support float in hardware etc  
-so there is a big difference expected in both memory and performance
+  - Note that some platforms map double to float
+  - others support float in hardware etc.  
+  - so expect a big difference in both memory and performance.
+
+#### Wont
+
 - create the constant **i** ??
+  - => expect conflicts with int i...
+
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
 
 
diff --git a/libraries/Complex/complex.cpp b/libraries/Complex/complex.cpp
index 4229377b..43ed1270 100644
--- a/libraries/Complex/complex.cpp
+++ b/libraries/Complex/complex.cpp
@@ -1,12 +1,10 @@
 //
 //    FILE: Complex.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.2
+// VERSION: 0.3.3
 // PURPOSE: Arduino library for Complex math
 //     URL: https://github.com/RobTillaart/Complex
 //          http://arduino.cc/playground/Main/ComplexMath
-//
-//  HISTORY: see changelog.md
 
 
 #include "Complex.h"
diff --git a/libraries/Complex/complex.h b/libraries/Complex/complex.h
index 195600da..9d5dbbfb 100644
--- a/libraries/Complex/complex.h
+++ b/libraries/Complex/complex.h
@@ -2,7 +2,7 @@
 //
 //    FILE: Complex.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.2
+// VERSION: 0.3.3
 // PURPOSE: Arduino library for Complex math
 //     URL: https://github.com/RobTillaart/Complex
 //          http://arduino.cc/playground/Main/ComplexMath
@@ -12,7 +12,7 @@
 #include "Printable.h"
 
 
-#define COMPLEX_LIB_VERSION                 (F("0.3.2"))
+#define COMPLEX_LIB_VERSION                 (F("0.3.3"))
 
 
 class Complex: public Printable
diff --git a/libraries/Complex/library.json b/libraries/Complex/library.json
index aac3ebda..0f489f75 100644
--- a/libraries/Complex/library.json
+++ b/libraries/Complex/library.json
@@ -15,9 +15,9 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/Complex.git"
   },
-  "version": "0.3.2",
+  "version": "0.3.3",
   "license": "MIT",
-  "frameworks": "arduino",
+  "frameworks": "*",
   "platforms": "*",
   "headers": "Complex.h"
 }
diff --git a/libraries/Complex/library.properties b/libraries/Complex/library.properties
index 3432609c..70667cdb 100644
--- a/libraries/Complex/library.properties
+++ b/libraries/Complex/library.properties
@@ -1,5 +1,5 @@
 name=Complex
-version=0.3.2
+version=0.3.3
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for Complex math.