diff --git a/embedded-workshop-book/src/usb-enumeration.md b/embedded-workshop-book/src/usb-enumeration.md
index 5fff864..f5f8e01 100644
--- a/embedded-workshop-book/src/usb-enumeration.md
+++ b/embedded-workshop-book/src/usb-enumeration.md
@@ -12,7 +12,7 @@ A USB device, like the nRF52840, can be one of these three states:
 
 After being powered the device will start in the Default state. The enumeration process will take the device from the Default state to the Address state. As a result of the enumeration process the device will be assigned an address, in the range `1..=127`, by the host.
 
-The USB protocol is complex so we'll leave out many details and focus only on the concepts required to get enumeration and configuration working. There are also several USB specific terms so we recommend checking chapter 2, "Terms and Abbreviations", of the USB specification (linked at the bottom of this document) every now and then.
+The USB protocol is complex so we'll leave out many details and focus only on the concepts required to get enumeration and configuration working. There are also several USB specific terms so we recommend checking chapter 2, "Terms and Abbreviations", of [the USB specification](https://www.usb.org/document-library/usb-20-specification) every now and then.
 
 Each OS may perform the enumeration process slightly differently but the process will always involve these host actions: