diff --git a/documentation/build_docs.md b/documentation/build_docs.md
index 36c9fc5..bcbead9 100644
--- a/documentation/build_docs.md
+++ b/documentation/build_docs.md
@@ -14,7 +14,7 @@ these are the parts you need to get. to reduce shipping costs to nz i sourced th
 
 - [raspberry pi screen] *12 USD*
 
-- [usb keypad] *9 USD*
+- [usb keypad (AliExpress)] or [usb keypad (Amazon)]  *9 USD*
 
 ![main parts][main parts]
 
@@ -67,4 +67,4 @@ you are done ! wasnt that easy ?
 [operate docs]: ./operate_docs.md
 [instructions to install]: ../dotfiles/README.md 
 [these rubber feet]: https://www.aliexpress.com/item/40-Self-Adhesive-Rubber-Bumper-Stopper-Non-slip-Feet-Door-Buffer-Pads-Furniture-DIY-Tool/32849514475.html?spm=a2g0s.9042311.0.0.6ee14c4dFXynVK
-[faq]: ./faq.md
\ No newline at end of file
+[faq]: ./faq.md