diff --git a/src/en/overlay/arduino-spi.md b/src/en/overlay/arduino-spi.md
index 1841c25..dfece1a 100644
--- a/src/en/overlay/arduino-spi.md
+++ b/src/en/overlay/arduino-spi.md
@@ -3,22 +3,22 @@
 name: Arduino SPI
 description: Program Arduino with Raspberry Pi SPI
 pin:
-  19:
+  '19':
     name: MOSI
     direction: output
     active: high
     description: Master Out / Slave In
-  21:
+  '21':
     name: MISO
     direction: input
     active: high
     description: Master In / Slave Out
-  23:
+  '23':
     name: SCKL
     direction: output
     active: high
     description: Clock
-  24:
+  '24':
     name: CE0
     direction: output
     active: high
diff --git a/src/en/overlay/display-o-tron-hat.md b/src/en/overlay/display-o-tron-hat.md
index 9dbf68a..41b6a67 100644
--- a/src/en/overlay/display-o-tron-hat.md
+++ b/src/en/overlay/display-o-tron-hat.md
@@ -6,26 +6,26 @@ url: https://github.com/pimoroni/dot3k
 description: A 3-line character LCD with a 6-zone RGB backlight and 6 touch buttons
 pincount: 40
 pin:
-  3:
+  '3':
     mode: i2c
-  5:
+  '5':
     mode: i2c
-  22:
+  '22':
     name: LCD CMD/DATA
     mode: output
     active: high
-  19:
+  '19':
     mode: spi
-  22:
+  '22':
     name: LCD Register Select
     mode: output
-  23:
+  '23':
     mode: spi
-  24:
+  '24':
     name: LCD Chip Select
     mode: chipselect
     active: high
-  32:
+  '32':
     name: LCD Reset
     mode: output
     active: low
diff --git a/src/en/overlay/display-o-tron.md b/src/en/overlay/display-o-tron.md
index 4532b90..c02b808 100644
--- a/src/en/overlay/display-o-tron.md
+++ b/src/en/overlay/display-o-tron.md
@@ -19,37 +19,37 @@ install:
   'examples': 'python/examples/'
 pincount: 40
 pin:
-  3:
+  '3':
     mode: i2c
-  5:
+  '5':
     mode: i2c
-  7:
+  '7':
     name: Joystick Button
     mode: input
     active: low
-  11:
+  '11':
     name: Joystick Left
     mode: input
     active: low
-  13:
+  '13':
     name: Joystick Up
     mode: input
     active: low
-  15:
+  '15':
     name: Joystick Right
     mode: input
     active: low
-  19:
+  '19':
     mode: spi
-  21:
+  '21':
     name: Joystick Down
     mode: input
     active: low
-  22:
+  '22':
     name: LCD CMD/DATA
     mode: output
     active: high
-  23:
+  '23':
     mode: spi
 -->
 #Display-o-Tron 3000
diff --git a/src/en/overlay/iqaudio-pi-dac.md b/src/en/overlay/iqaudio-pi-dac.md
index 85b7c8a..1e8e95e 100644
--- a/src/en/overlay/iqaudio-pi-dac.md
+++ b/src/en/overlay/iqaudio-pi-dac.md
@@ -9,29 +9,29 @@ install:
     - 'i2c'
 pincount: 40
 pin:
-  3:
+  '3':
     mode: i2c
-  5:
+  '5':
     mode: i2c
-  12:
+  '12':
     name: I2S
-  15:
+  '15':
     name: Mute/Unmute
     description: Pi-AMP+ only (optional) 
-  16:
+  '16':
     name: Rotary Encoder
     description: (optional) 
-  18:
+  '18':
     name: Rotary Encoder
     description: (optional)
-  22:
+  '22':
     name: IR Sensor
     description: (optional) 
-  35:
+  '35':
     name: I2S
-  38:
+  '38':
     name: I2S
-  40:
+  '40':
     name: I2S
 -->
 #IQaudIO Pi-DAC+
diff --git a/src/en/overlay/piano-hat.md b/src/en/overlay/piano-hat.md
index 623e460..c390710 100644
--- a/src/en/overlay/piano-hat.md
+++ b/src/en/overlay/piano-hat.md
@@ -15,20 +15,20 @@ i2c:
     device: cap1188
     datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/CAP1188%20.pdf
 pin:
-  3:
+  '3':
     mode: i2c
-  5:
+  '5':
     mode: i2c
-  7:
+  '7':
     name: Alert A
     mode: input
-  11:
+  '11':
     name: Reset A
     mode: output
-  13:
+  '13':
     name: Alert B
     mode: input
-  15:
+  '15':
     name: Reset B
     mode: output
 -->
diff --git a/src/en/overlay/sense-hat.md b/src/en/overlay/sense-hat.md
index ce00d66..7e3c1c1 100644
--- a/src/en/overlay/sense-hat.md
+++ b/src/en/overlay/sense-hat.md
@@ -10,26 +10,26 @@ install:
     - 'spi'    
 pincount: 40
 pin:
-  3:
+  '3':
     mode: i2c
-  5:
+  '5':
     mode: i2c
-  16:
+  '16':
     name: Joystick
     mode: input
-  18:
+  '18':
     name: Joystick
     mode: input
-  19:
+  '19':
     mode: spi
-  21:
+  '21':
     mode: spi
-  22:
+  '22':
     name: Joystick
     mode: input
-  23:
+  '23':
     mode: spi
-  24:
+  '24':
     mode: spi
 -->
 #Sense HAT