diff --git a/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex b/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
index e3d32735cc..154d54c2c8 100644
--- a/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
+++ b/slides/yocto-recipe-advanced/yocto-recipe-advanced.tex
@@ -458,6 +458,9 @@ \subsection{Network usage}
 
 \begin{frame}{Forbidding network access}
   \begin{itemize}
+    \item Since Kirkstone (4.0), network access is only enabled
+          in the \code{do_fetch} class, to make sure no untraced sources
+	  are fetched.
     \item You can also completely disable network access using
       \yoctovar{BB_NO_NETWORK = "1"}
       \begin{itemize}