diff --git a/01-introduction/README.md b/01-introduction/README.md
index 2aea1bc..ebc0ff3 100644
--- a/01-introduction/README.md
+++ b/01-introduction/README.md
@@ -32,8 +32,8 @@ are not permitted. The following operations are supported:
 
 ## Setup
 
-To set up C on your computer, please consult [Daniel Holden's](/orangeduck)
-guide in the [Build Your Own
+To set up C on your computer, please consult [Daniel
+Holden's](https://github.com/orangeduck) guide in the [Build Your Own
 Lisp](http://www.buildyourownlisp.com/chapter2_installation) book.  Build Your
 Own Lisp is a great book, and I recommend working through it.