diff --git a/libraries/MCP23S17/.github/workflows/arduino-lint.yml b/libraries/MCP23S17/.github/workflows/arduino-lint.yml
index b2ca058c..8a26f14a 100644
--- a/libraries/MCP23S17/.github/workflows/arduino-lint.yml
+++ b/libraries/MCP23S17/.github/workflows/arduino-lint.yml
@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: arduino/arduino-lint-action@v1
         with:
           library-manager: update
diff --git a/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml b/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
index 096b975b..fadfa904 100644
--- a/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
+++ b/libraries/MCP23S17/.github/workflows/arduino_test_runner.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
diff --git a/libraries/MCP23S17/.github/workflows/jsoncheck.yml b/libraries/MCP23S17/.github/workflows/jsoncheck.yml
index 04603d08..37a11298 100644
--- a/libraries/MCP23S17/.github/workflows/jsoncheck.yml
+++ b/libraries/MCP23S17/.github/workflows/jsoncheck.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: json-syntax-check
         uses: limitusus/json-syntax-check@v1
         with:
diff --git a/libraries/MCP23S17/CHANGELOG.md b/libraries/MCP23S17/CHANGELOG.md
index 249d1f21..4719086b 100644
--- a/libraries/MCP23S17/CHANGELOG.md
+++ b/libraries/MCP23S17/CHANGELOG.md
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.2.4] - 2023-02-04
+- update readme.md
+- update GitHub actions
+- update license 2023
+
+
 ## [0.2.3] - 2022-10-20
 - add CHANGELOG.md
 - add **enableControlRegister(uint8_t mask)**
@@ -21,21 +27,21 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - add getAddress() + optimized (_address << 1)
 - update readme.md
 
-## [0.2.0] - 2022-06-28  
+## [0.2.0] - 2022-06-28
 - fix #10 incorrect mask
 
 ----
 
-## [0.1.3] - 2022-04-13  
+## [0.1.3] - 2022-04-13
 - fix compiling for NANO33 BLE
 
-## [0.1.2] - 2022-01-12  
+## [0.1.2] - 2022-01-12
 - change the URL for library manager
 
-## [0.1.1] - 2022-01-10  
+## [0.1.1] - 2022-01-10
 - add 16 bit interface
 
-## [0.1.0] - 2021-12-30  
+## [0.1.0] - 2021-12-30
 - initial version (a 2019 version did not make it)
 
 
diff --git a/libraries/MCP23S17/LICENSE b/libraries/MCP23S17/LICENSE
index 5777550e..088bbaf1 100644
--- a/libraries/MCP23S17/LICENSE
+++ b/libraries/MCP23S17/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021-2022 Rob Tillaart
+Copyright (c) 2021-2023 Rob Tillaart
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/libraries/MCP23S17/MCP23S17.cpp b/libraries/MCP23S17/MCP23S17.cpp
index 02e48ba4..e8960caf 100644
--- a/libraries/MCP23S17/MCP23S17.cpp
+++ b/libraries/MCP23S17/MCP23S17.cpp
@@ -1,12 +1,10 @@
 //
 //    FILE: MCP23S17.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.3
+// VERSION: 0.2.4
 // PURPOSE: Arduino library for SPI MCP23S17 16 channel port expander
 //    DATE: 2021-12-30
 //     URL: https://github.com/RobTillaart/MCP23S17
-//
-//  HISTORY see changelog.md
 
 
 #include "MCP23S17.h"
@@ -47,7 +45,8 @@ bool MCP23S17::begin()
   ::pinMode(_select, OUTPUT);
   ::digitalWrite(_select, HIGH);
 
-  _spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);  //  8 MHz - datasheet page 8
+  //  8 MHz - datasheet page 8
+  _spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
 
   if (_hwSPI)
   {
@@ -68,9 +67,9 @@ bool MCP23S17::begin()
   if (! isConnected()) return false;
 
   //  disable address increment (datasheet P20
-  //   SEQOP: Sequential Operation mode bit
-  //   1 = Sequential operation disabled, address pointer does not increment.
-  //   0 = Sequential operation enabled, address pointer increments.
+  //    SEQOP: Sequential Operation mode bit
+  //    1 = Sequential operation disabled, address pointer does not increment.
+  //    0 = Sequential operation enabled, address pointer increments.
   if (! writeReg(MCP23S17_IOCR, MCP23S17_IOCR_SEQOP)) return false;
 
   //  Force INPUT_PULLUP
@@ -391,7 +390,7 @@ int MCP23S17::read8(uint8_t port)
   }
   _error = MCP23S17_OK;
   if (port == 0) return readReg(MCP23S17_GPIO_A);
-  return readReg(MCP23S17_GPIO_B);  // port == 1
+  return readReg(MCP23S17_GPIO_B);  //  port == 1
 }
 
 
@@ -606,7 +605,7 @@ bool MCP23S17::writeReg(uint8_t reg, uint8_t value)
   {
     _mySPI->beginTransaction(_spi_settings);
     //  _address already shifted
-    _mySPI->transfer(MCP23S17_WRITE_REG | _address ); 
+    _mySPI->transfer(MCP23S17_WRITE_REG | _address );
     _mySPI->transfer(reg);
     _mySPI->transfer(value);
     _mySPI->endTransaction();
@@ -675,5 +674,5 @@ uint8_t  MCP23S17::swSPI_transfer(uint8_t val)
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/libraries/MCP23S17/MCP23S17.h b/libraries/MCP23S17/MCP23S17.h
index b49007b4..805a0975 100644
--- a/libraries/MCP23S17/MCP23S17.h
+++ b/libraries/MCP23S17/MCP23S17.h
@@ -2,7 +2,7 @@
 //
 //    FILE: MCP23S17.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.3
+// VERSION: 0.2.4
 // PURPOSE: Arduino library for SPI MCP23S17 16 channel port expander
 //    DATE: 2021-12-30
 //     URL: https://github.com/RobTillaart/MCP23S17
@@ -12,7 +12,7 @@
 #include "SPI.h"
 #include "MCP23S17_registers.h"
 
-#define MCP23S17_LIB_VERSION              (F("0.2.3"))
+#define MCP23S17_LIB_VERSION              (F("0.2.4"))
 
 //  ERROR CODES
 #define MCP23S17_OK                       0x00
@@ -32,9 +32,9 @@ const uint32_t MCP23S17_MAX_SPI_SPEED = 10000000;
 class MCP23S17
 {
 public:
-  //  SW SPI
+  //  SOFTWARE SPI
   MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address = 0x00);
-  //  HW SPI
+  //  HARDWARE SPI
   MCP23S17(uint8_t select, SPIClass* spi);
   MCP23S17(uint8_t select, uint8_t address = 0x00, SPIClass* spi = &SPI);
 
@@ -118,5 +118,5 @@ private:
 };
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/libraries/MCP23S17/MCP23S17_registers.h b/libraries/MCP23S17/MCP23S17_registers.h
index 013a7ad0..4b120439 100644
--- a/libraries/MCP23S17/MCP23S17_registers.h
+++ b/libraries/MCP23S17/MCP23S17_registers.h
@@ -42,5 +42,5 @@
 #define MCP23S17_IOCR_NI        0x01    //  Not implemented.
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/libraries/MCP23S17/README.md b/libraries/MCP23S17/README.md
index 4c111aeb..0a47f99c 100644
--- a/libraries/MCP23S17/README.md
+++ b/libraries/MCP23S17/README.md
@@ -19,19 +19,39 @@ This IC is strongly related to the MCP23017 I2C port expander - https://github.c
 Programming Interface is kept the same as much as possible.
 
 
+#### Related
+
+16 bit port expanders
+
+- https://github.com/RobTillaart/MCP23017_RT
+- https://github.com/RobTillaart/MCP23S17
+- https://github.com/RobTillaart/PCF8575
+
+
+8 bit port expanders
+
+- https://github.com/RobTillaart/MCP23008
+- https://github.com/RobTillaart/MCP23S08
+- https://github.com/RobTillaart/PCF8574
+
+
 ## Interface
 
+```cpp
+#include "MCP23S17.h"
+```
+
 ### Constructor
 
-- **MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address = 0x00)** constructor SW SPI.
-- **MCP23S17(uint8_t select, SPIClass\* spi)** constructor HW SPI with explicit SPI interface selected.
-- **MCP23S17(uint8_t select, uint8_t address = 0x00, SPIClass\* spi = &SPI)** constructor HW SPI with optional address pins and SPI interface.
+- **MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address = 0x00)** constructor SOFTWARE SPI.
+- **MCP23S17(uint8_t select, SPIClass\* spi)** constructor HARDWARE SPI with explicit SPI interface selected.
+- **MCP23S17(uint8_t select, uint8_t address = 0x00, SPIClass\* spi = &SPI)** constructor HARDWARE SPI with optional address pins and SPI interface.
 - **bool begin()** returns true if successful.
 - **bool isConnected()** returns true if connected, false otherwise. (dummy for compatibility reasons)
 - **uint8_t getAddress()** returns the address set in the constructor. 
 Default = 0, range = 0..7.
 
-The two constructors allow to call 4 different constructors.
+The two hardware constructors allow to call 4 different constructors.
 
 ```cpp
 - MCP23S17(10);            // select pin only
@@ -103,14 +123,15 @@ Read the datasheet carefully!
 
 |  constant              |  mask  |  description  |
 |:-----------------------|:------:|:--------------|
-|  MCP23S17_IOCR_BANK    |  0x80  | Controls how the registers are addressed.
-|  MCP23S17_IOCR_MIRROR  |  0x40  | INT Pins Mirror bit.
-|  MCP23S17_IOCR_SEQOP   |  0x20  | Sequential Operation mode bit.
-|  MCP23S17_IOCR_DISSLW  |  0x10  | Slew Rate control bit for SDA output.
-|  MCP23S17_IOCR_HAEN    |  0x08  | Hardware Address Enable bit (MCP23S17 only).
-|  MCP23S17_IOCR_ODR     |  0x04  | Configures the INT pin as an open-drain output.
-|  MCP23S17_IOCR_INTPOL  |  0x02  | This bit sets the polarity of the INT output pin.
-|  MCP23S17_IOCR_NI      |  0x01  | Not implemented. 
+|  MCP23S17_IOCR_BANK    |  0x80  |  Controls how the registers are addressed.
+|  MCP23S17_IOCR_MIRROR  |  0x40  |  INT Pins Mirror bit.
+|  MCP23S17_IOCR_SEQOP   |  0x20  |  Sequential Operation mode bit.
+|  MCP23S17_IOCR_DISSLW  |  0x10  |  Slew Rate control bit for SDA output.
+|  MCP23S17_IOCR_HAEN    |  0x08  |  Hardware Address Enable bit (MCP23S17 only).
+|  MCP23S17_IOCR_ODR     |  0x04  |  Configures the INT pin as an open-drain output.
+|  MCP23S17_IOCR_INTPOL  |  0x02  |  This bit sets the polarity of the INT output pin.
+|  MCP23S17_IOCR_NI      |  0x01  |  Not implemented. 
+
 
 ### Error codes
 
@@ -119,14 +140,14 @@ If one of the above functions return false, there might be an error.
 - **int lastError()** Above functions set an error flag that can be read with this function.  
 Reading it will reset the flag to **MCP23S17_OK**.
 
-| NAME                    | VALUE  | DESCRIPTION |
-|:------------------------|:------:|:------------|
-| MCP23S17_OK             |  0x00  | No error    |
-| MCP23S17_PIN_ERROR      |  0x81  |
-| MCP23S17_I2C_ERROR      |  0x82  | (compatibility)
-| MCP23S17_VALUE_ERROR    |  0x83  |
-| MCP23S17_PORT_ERROR     |  0x84  |
-| MCP23S17_REGISTER_ERROR |  0xFF  | low level.
+|  name                     |  value  |  description  |
+|:--------------------------|:-------:|:--------------|
+|  MCP23S17_OK              |  0x00   |  No error     |
+|  MCP23S17_PIN_ERROR       |  0x81   |
+|  MCP23S17_I2C_ERROR       |  0x82   |  (compatibility)
+|  MCP23S17_VALUE_ERROR     |  0x83   |
+|  MCP23S17_PORT_ERROR      |  0x84   |
+|  MCP23S17_REGISTER_ERROR  |  0xFF   |  low level.
 
 
 ## Operation
@@ -136,16 +157,15 @@ See examples.
 
 ## Future
 
-#### must
+#### Must
 
 - improve documentation
-  - references to I2C version?
 
-#### should
+#### Should
 
 - keep functional in sync with MCP23017_RT
 
-#### could 
+#### Could 
 
 - check need for writing in all functions (Polarity / pullup)
   - check if bit mask changes.
@@ -155,7 +175,7 @@ See examples.
   - SW_SPI is roughly equal in performance as HW SPI on ESP32.
 - investigate and reimplement the INPUT_PULLUP for pinMode() ?
 
-#### wont
+#### Wont
 
 - check address range in constructor.
 
diff --git a/libraries/MCP23S17/library.json b/libraries/MCP23S17/library.json
index 1784c995..97925e02 100644
--- a/libraries/MCP23S17/library.json
+++ b/libraries/MCP23S17/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/MCP23S17.git"
   },
-  "version": "0.2.3",
+  "version": "0.2.4",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/MCP23S17/library.properties b/libraries/MCP23S17/library.properties
index b6c6bbc3..86010815 100644
--- a/libraries/MCP23S17/library.properties
+++ b/libraries/MCP23S17/library.properties
@@ -1,5 +1,5 @@
 name=MCP23S17
-version=0.2.3
+version=0.2.4
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for SPI MCP23S17 16 channel port expander  16 IO-lines
diff --git a/libraries/MCP23S17/test/unit_test_001.cpp b/libraries/MCP23S17/test/unit_test_001.cpp
index 290e1944..6e5fe603 100644
--- a/libraries/MCP23S17/test/unit_test_001.cpp
+++ b/libraries/MCP23S17/test/unit_test_001.cpp
@@ -259,4 +259,6 @@ unittest(test_SPIspeed)
 
 unittest_main()
 
-// --------
+
+//  -- END OF FILE --
+