diff --git a/build documentation.md b/build documentation.md
index 9108b99..f5804cc 100644
--- a/build documentation.md	
+++ b/build documentation.md	
@@ -4,19 +4,21 @@
 
 these are the parts you need to get. to reduce costs i sourced them through aliexpress.com but if you have other parts lying around try them out and let me know how it goes.
 
-main parts:
+### main parts:
 
-- [raspberry pi3](https://www.aliexpress.com/item/RS-Version-2016-New-Raspberry-Pi-3-Model-B-Board-1GB-LPDDR2-BCM2837-Quad-Core-Ras/32789942633.html?spm=a2g0s.9042311.0.0.FkRWty) *37 USD* (watch this space for experiments with other models/sbc's)
+- [raspberry pi3] *37 USD* (watch this space for experiments with other models/sbc's)
 
-- [raspberry pi screen](https://www.aliexpress.com/item/New-3-5-inch-Raspberry-Pi-LCD-TFT-Touchscreen-Display-Touch-Shield-Raspberry-pi-2-Model/32605410449.html?spm=a2g0s.9042311.0.0.ZW1WDU) *12 USD*
+![alt text][raspberry pi image]
 
-- [usb keypad](https://www.aliexpress.com/item/2-4G-Wireless-Keyboard-USB-Numeric-Keypad-19-Keys-Mini-Digital-Keyboard-Ultra-Slim-Number-Pad/32818206308.html?spm=a2g0s.9042311.0.0.FkRWty) *9 USD*
+- [raspberry pi screen] *12 USD*
+
+- [usb keypad] *9 USD*
 
 other bits and pieces:
 
 - xxx and yyy size screws and nuts - a few dollars (exact sizes, links etc coming soon)
 
-- 8 gig mircoSD card
+- >=8 gig mircoSD card
 
 - stable 5volt1A microUsb power supply
 
@@ -47,3 +49,8 @@ other bits and pieces:
 - attach top panel and hold with nuts
 
 ## try it owt
+
+[raspberry pi3]:https://www.aliexpress.com/item/RS-Version-2016-New-Raspberry-Pi-3-Model-B-Board-1GB-LPDDR2-BCM2837-Quad-Core-Ras/32789942633.html?spm=a2g0s.9042311.0.0.FkRWty
+[raspberry pi image]: ./images/build_01_pi.jpg
+[raspberry pi screen]:https://www.aliexpress.com/item/New-3-5-inch-Raspberry-Pi-LCD-TFT-Touchscreen-Display-Touch-Shield-Raspberry-pi-2-Model/32605410449.html?spm=a2g0s.9042311.0.0.ZW1WDU
+[usb keypad]:https://www.aliexpress.com/item/2-4G-Wireless-Keyboard-USB-Numeric-Keypad-19-Keys-Mini-Digital-Keyboard-Ultra-Slim-Number-Pad/32818206308.html?spm=a2g0s.9042311.0.0.FkRWty
\ No newline at end of file
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