Fix broken link to Principles page

modules/ROOT/pages/getting-started.adoc

diff --git a/modules/ROOT/pages/getting-started.adoc b/modules/ROOT/pages/getting-started.adoc
index 89cd918..80faf46 100644
--- a/modules/ROOT/pages/getting-started.adoc
+++ b/modules/ROOT/pages/getting-started.adoc
@@ -228,4 +228,4 @@
 == What's next?
 To deepen your understanding, step through the xref:tutorial:index.adoc[Tapestry Tutorial], which goes into much more detail about setting up your project as well as loading it into Eclipse... then continues on to teach you more about Tapestry.
 
-Be sure to read about the core xref:userguide::principles.adoc[Tapestry Principles], and browse the xref:userguide::index.adoc[User Guide].
+Be sure to read about the core xref:principles.adoc[Tapestry Principles], and browse the xref:userguide::index.adoc[User Guide].