update URL

Open-Astrophysics-Bookshelf · Aug 29, 2023 · ae2370a · ae2370a
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diff --git a/preface/preface.tex b/preface/preface.tex
@@ -26,7 +26,7 @@
 A PDF version of the notes is always available
 at: \\[0.25em]
 %
-\url{http://bender.astro.sunysb.edu/hydro_by_example/CompHydroTutorial.pdf} \\[0.25em]
+\url{https://open-astrophysics-bookshelf.github.io/numerical_exercises/CompHydroTutorial.pdf} \\[0.25em]
 %
 These notes are updated at irregular intervals, usually when I have a
 new student working with me, or if I am using them for a course.