diff --git a/book/index.adoc b/book/index.adoc
index cf643c9..8e134f4 100644
--- a/book/index.adoc
+++ b/book/index.adoc
@@ -27,7 +27,7 @@ _How PHP Developers can create robust and reproducible applications with Nix._
 
 [cols="^.^1,1,1",options="autowidth"]
 |===
-| https://www.oliverdavies.uk | link:./opdavies-nix-for-php-developers.pdf[Download PDF] | link:./opdavies-nix-for-php-developers.epub[Download EPUB]
+| https://www.oliverdavies.uk | link:./nix-for-php-developers/opdavies-nix-for-php-developers.pdf[Download PDF] | link:./nix-for-php-developers/opdavies-nix-for-php-developers.epub[Download EPUB]
 |===
 
 include::introduction/index.adoc[]