diff --git a/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex b/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
index c2a6e9c7ba..9a60adb248 100644
--- a/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
+++ b/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
@@ -147,19 +147,17 @@ \subsection{Classes}
 \begin{frame}
   \frametitle{Common classes}
   \begin{itemize}
-    \begin{itemize}
-      \item \code{classes-global/base.bbclass}
-      \item \code{classes-recipe/kernel.bbclass}
-      \item \code{classes-recipe/autotools.bbclass}
-      \item \code{classes-recipe/autotools-brokensep.bbclass}
-      \item \code{classes-recipe/cmake.bbclass}
-      \item \code{classes-recipe/meson.bbclass}
-      \item \code{classes-recipe/native.bbclass}
-      \item \code{classes-recipe/systemd.bbclass}
-      \item \code{classes-recipe/update-rc.d.bbclass}
-      \item \code{classes/useradd.bbclass}
-      \item \dots
-    \end{itemize}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#base}{classes-global/base.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#kernel}{classes-recipe/kernel.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#autotools}{classes-recipe/autotools.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#autotools}{classes-recipe/autotools-brokensep.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#cmake}{classes-recipe/cmake.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#meson}{classes-recipe/meson.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#native}{classes-recipe/native.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#systemd}{classes-recipe/systemd.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#update-rc-d}{classes-recipe/update-rc.d.bbclass}
+    \item \href{https://docs.yoctoproject.org/ref-manual/classes.html\#useradd}{classes/useradd.bbclass}
+    \item \dots
   \end{itemize}
 \end{frame}