diff --git a/libraries/HT16K33/HT16K33.cpp b/libraries/HT16K33/HT16K33.cpp
index 884b5f02..a4360d53 100644
--- a/libraries/HT16K33/HT16K33.cpp
+++ b/libraries/HT16K33/HT16K33.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: HT16K33.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.4
+// VERSION: 0.3.5
 //    DATE: 2019-02-07
 // PURPOSE: Arduino Library for HT16K33 4x7segment display
 //     URL: https://github.com/RobTillaart/HT16K33
@@ -13,11 +13,13 @@
 //  0.1.3   2019-10-07  fixed clear, added suppressLeadingZeroPlaces();
 //  0.1.4   2019-11-28  added displayRaw(), displayVULeft(), displayVURight()
 //  0.1.5   2019-11-30  refactor,
+//
 //  0.2.0   2020-06-13  ESP32 support; fix brightness bug;
 //  0.2.1   2020-07-15  fix #160 - decimal point
 //  0.2.2   2020-10-04  added displayDate() thanks to bepitama
 //  0.2.3   2020-10-09  issue #4 add negative values for displayInt()
 //  0.2.4   2020-10-10  refactor #5 setDigits() iso suppressLeadingZeroPlaces()
+//
 //  0.3.0   2020-10-12  negative float, cache control, extend displayRaw()
 //  0.3.1   2020-12-28  Arduino-CI, unit test (framework only),
 //  0.3.2   2021-01-14  add WireN support,
@@ -26,6 +28,8 @@
 //                      add displayFloat(f, decimals);  // experimental
 //  0.3.3   2021-05-26  fix #17 add leadingZero flag in displayTIme() [Kudos to OwenDuffy]
 //  0.3.4   2021-12-19  update library.json, license, minor edits
+//  0.3.5   2022-09-23  fix #21 additional LEDs on the display
+//                              used in a special layout   :88:8'8
 
 
 #include "HT16K33.h"
@@ -498,6 +502,16 @@ void HT16K33::displayColon(uint8_t on)
 }
 
 
+void HT16K33::displayExtraLeds(uint8_t value)
+{
+  if (value > 30)
+  {
+    return;  //  no leds.
+  }
+  writePos(2, value);
+}
+
+
 void HT16K33::dumpSerial(uint8_t *array, uint8_t point)
 {
   // to debug without display
diff --git a/libraries/HT16K33/HT16K33.h b/libraries/HT16K33/HT16K33.h
index 1c8558d9..1d6ff420 100644
--- a/libraries/HT16K33/HT16K33.h
+++ b/libraries/HT16K33/HT16K33.h
@@ -2,7 +2,7 @@
 //
 //    FILE: HT16K33.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.4
+// VERSION: 0.3.5
 //    DATE: 2019-02-07
 // PURPOSE: Arduino Library for HT16K33 4x7segment display
 //          http://www.adafruit.com/products/1002
@@ -14,7 +14,7 @@
 #include "Wire.h"
 
 
-#define HT16K33_LIB_VERSION         (F("0.3.4"))
+#define HT16K33_LIB_VERSION         (F("0.3.5"))
 
 
 // Characters
@@ -90,6 +90,14 @@ public:
   void displayColon(uint8_t on);                 // 0 = off
   void displayRaw(uint8_t *array, bool colon = false);  // max control
 
+  //  from issue #21 - used in special layout   :88:8'8   normal = 88:88 or 8.8.8.8
+  //  value = 0 ==> all off.
+  //   2 = colon
+  //   4 = upper left point, left of the 1st digit
+  //   8 = lower left point, left of the 1st digit
+  //  16 = upper point between 3rd and 4th digit
+  void displayExtraLeds(uint8_t value);
+
   bool displayVULeft(uint8_t value);        // 0..8
   bool displayVURight(uint8_t value);       // 0..8
 
diff --git a/libraries/HT16K33/README.md b/libraries/HT16K33/README.md
index a934f058..ecfd042e 100644
--- a/libraries/HT16K33/README.md
+++ b/libraries/HT16K33/README.md
@@ -119,6 +119,20 @@ These functions are new and still under investigation.
 - **void display(uint8_t \* array, uint8_t point)** idem + point = position of the digit with point (0..3).
 - **void displayColon(uint8_t on)** 0 = off, all values other are on.
 - **void displayRaw(uint8_t \* array, bool colon)** array of 4 bytes to control one 7seg display + colon flag.
+- **void displayExtraLeds(uint8_t value)** switch on extra leds.
+value is in fact a bit mask see table below. 0 = all off.
+
+#### Extra Leds table
+
+|  mask  |  description  |
+|:------:|:--------------|
+|  0x00  |  all off 
+|  0x02  |  colon.
+|  0x04  |  upper left point, left of the 1st digit.
+|  0x08  |  lower left point, left of the 1st digit.
+|  0x10  |  upper point between 3rd and 4th digit.
+
+( based upon issue #21 )
 
 
 ### Debugging
@@ -139,7 +153,8 @@ See examples
 
 ## Future
 
-**0.4.0**
+#### 0.4.0
+
 - **bool isDisplayOn()** and similar state functions
   - configuration byte: 4 bits brightness, 1 bit on off flag, 1 bit cache flag, 2 blink rate
 - **void setBrightness()** and **uint8_t getBrightness()**
@@ -147,8 +162,10 @@ See examples
 - **void getDigits()**
 - **FixedPoint()** regular (experimental in 0.3.2)
 - overflow flag ? or not decision
+- move all code to .cpp file
+  - even the small functions.
 
-**unknown**
+#### unknown
 - VU metering using halve bars allows two VU from 0..8   **new**
 - VU metering using halve bars allows one VU from 0..17. extension of current VUleft/right
 - optimize the math if possible - performance and footprint. +float + int division
diff --git a/libraries/HT16K33/keywords.txt b/libraries/HT16K33/keywords.txt
index e5c34246..6c4c25fe 100644
--- a/libraries/HT16K33/keywords.txt
+++ b/libraries/HT16K33/keywords.txt
@@ -38,6 +38,8 @@ displayColon	KEYWORD2
 displayTest	KEYWORD2
 displayRaw	KEYWORD2
 
+displayExtraLeds	KEYWORD2
+
 displayVULeft	KEYWORD2
 displayVURight	KEYWORD2
 
diff --git a/libraries/HT16K33/library.json b/libraries/HT16K33/library.json
index 4d566767..df8b3327 100644
--- a/libraries/HT16K33/library.json
+++ b/libraries/HT16K33/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/HT16K33.git"
   },
-  "version": "0.3.4",
+  "version": "0.3.5",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/HT16K33/library.properties b/libraries/HT16K33/library.properties
index 5b65f7eb..722500bf 100644
--- a/libraries/HT16K33/library.properties
+++ b/libraries/HT16K33/library.properties
@@ -1,5 +1,5 @@
 name=HT16K33
-version=0.3.4
+version=0.3.5
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino Library for HT16K33 I2C 4x7segment display