diff --git a/index.html b/index.html
index f65dff9834877e315ff87a08ad12f56e6aefc2b5..75f121c6584594be0e5b43cbe70e122304e913a0 100644
--- a/index.html
+++ b/index.html
@@ -39,116 +39,140 @@ The GPIO test measures how quickly pins can communicate with a processor core; t
 <th>date</th>
 </tr>
 
+RPi.GPIO
+https://pypi.org/project/RPi.GPIO/
+works
+345 kHz
+
+gpiozero
+https://gpiozero.readthedocs.io/en/stable/
+works, slow
+29 kHz
+
 <tr>
 <td>16.66</td>
 <td>PocketBeagle</td>
-<td><a href=GPIO/BeagleBoard/index.html>PRU</a></td>
-<td>March, 2019</td>
+<td><a href=GPIO/BeagleBoard/index.html>C, PRU</a></td>
+<td>March 2019</td>
 </tr>
 
 <tr>
 <td>4.616</td>
 <td>ATSAME54</td>
-<td><a href=https://gitlab.cba.mit.edu/pub/ring/-/tree/master/GPIO/ATSAME54>SRAM (aligned)</a></td>
-<td>January, 2021</td>
+<td><a href=https://gitlab.cba.mit.edu/pub/ring/-/tree/master/GPIO/ATSAME54>C, SRAM (aligned)</a></td>
+<td>January 2021</td>
 </tr>
 
 <tr>
 <td>4.000</td>
 <td>ATxmega8E5</td>
-<td><a href=GPIO/ATxmega8E5/hello.ftdi.8E5.ring.c>VPORT</a></td>
-<td>October, 2015</td>
+<td><a href=GPIO/ATxmega8E5/hello.ftdi.8E5.ring.c>C, VPORT</a></td>
+<td>October 2015</td>
 </tr>
 
 <tr>
 <td>3.810</td>
 <td>ESP32-WROOM</td>
-<td><a href=GPIO/ESP32/ring.ESP32.ino>GPIO</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/ESP32/ring.ESP32.ino>C, GPIO</a></td>
+<td>December 2020</td>
 </tr>
 
 <tr>
 <td>3.737</td>
 <td>ATSAMD51</td>
-<td><a href=prior/gpio/atsamd51/index.html>PORT</a></td>
-<td>November, 2018</td>
+<td><a href=prior/gpio/atsamd51/index.html>C, PORT</a></td>
+<td>November 2018</td>
 </tr>
 
 <tr>
 <td>3.067</td>
 <td>Raspberry Pi 4</td>
-<td><a href=GPIO/bcm2835/ring.bcm2835.c>bcm2835, Buster</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/bcm2835/ring.bcm2835.c>C, bcm2835, Buster</a></td>
+<td>December 2020</td>
 </tr>
 
 <tr>
 <td>2.817</td>
 <td>Raspberry Pi Zero</td>
-<td><a href=GPIO/bcm2835/ring.bcm2835.c>bcm2835, Buster</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/bcm2835/ring.bcm2835.c>C, bcm2835, Buster</a></td>
+<td>December 2020</td>
 </tr>
 
 <tr>
 <td>2.528</td>
 <td>ATSAMD11C</td>
-<td><a href=GPIO/SAMD11C/ring.D11C.ino>IOBUS</a></td>
-<td>November, 2020</td>
+<td><a href=GPIO/SAMD11C/ring.D11C.ino>C, IOBUS</a></td>
+<td>November 2020</td>
 </tr>
 
 <tr>
 <td>2.172</td>
 <td>AVR128DB32</td>
-<td><a href=GPIO/AVR128DB32/index.html>VPORT</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/AVR128DB32/index.html>C, VPORT</a></td>
+<td>December 2020</td>
 </tr>
 
 <tr>
 <td>1.808</td>
 <td>ATtiny412</td>
-<td><a href=GPIO/ATtiny412/ring.t412.ino>DigitalReadFast/WriteFast</a></td>
-<td>March, 2021</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>Arduino, DigitalReadFast/WriteFast</a></td>
+<td>March 2021</td>
 </tr>
 
 <tr>
 <td>1.808</td>
 <td>ATtiny412</td>
-<td><a href=GPIO/ATtiny412/ring.t412.ino>VPORT</a></td>
-<td>November, 2020</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>C, VPORT</a></td>
+<td>November 2020</td>
 </tr>
 
 <tr>
 <td>1.171</td>
 <td>ATSAMD11C</td>
-<td><a href=GPIO/SAMD11C/ring.D11C.ino>PORT</a></td>
-<td>November, 2020</td>
+<td><a href=GPIO/SAMD11C/ring.D11C.ino>C, PORT</a></td>
+<td>November 2020</td>
 </tr>
 
 <tr>
 <td>1.056</td>
 <td>ATtiny412</td>
-<td><a href=GPIO/ATtiny412/ring.t412.ino>PORT</a></td>
-<td>November, 2020</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>C, PORT</a></td>
+<td>November 2020</td>
+</tr>
+
+<tr>
+<td>0.345</td>
+<td>Raspberry Pi 4</td>
+<td><a href=GPIO/RPi.GPIO/ring.RPi.GPIO.py>Python, RPi.GPIO, Buster</a></td>
+<td>March 2021</td>
 </tr>
 
 <tr>
 <td>0.331</td>
 <td>ATtiny412</td>
-<td><a href=GPIO/ATtiny412/ring.t412.ino>digitalRead/Write</a></td>
-<td>November, 2020</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>Arduino, digitalRead/Write</a></td>
+<td>November 2020</td>
 </tr>
 
 <tr>
 <td>0.153</td>
 <td>Raspberry Pi 4</td>
-<td><a href=GPIO/libgpiod/ring.libgpiod.c>libgpiod, Buster</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/libgpiod/ring.libgpiod.c>C, libgpiod, Buster</a></td>
+<td>December 2020</td>
 </tr>
 
 <tr>
 <td>0.153</td>
 <td>Raspberry Pi 4</td>
-<td><a href=GPIO/gpiolib/ring.gpiolib.c>gpiolib, Buster</a></td>
-<td>December, 2020</td>
+<td><a href=GPIO/gpiolib/ring.gpiolib.c>C, gpiolib, Buster</a></td>
+<td>December 2020</td>
+</tr>
+
+<tr>
+<td>0.029</td>
+<td>Raspberry Pi 4</td>
+<td><a href=GPIO/gpiozero/ring.gpiozero.py>Python, gpiozero, Buster</a></td>
+<td>March 2021</td>
 </tr>
 
 </table>