diff --git a/Packages/Manual/doc_tex_skel/basic/Preface/main.tex b/Packages/Manual/doc_tex_skel/basic/Preface/main.tex
index 0db04ac6416..1b4e8d10949 100644
--- a/Packages/Manual/doc_tex_skel/basic/Preface/main.tex
+++ b/Packages/Manual/doc_tex_skel/basic/Preface/main.tex
@@ -114,6 +114,11 @@ Tran Kai Frank Da ({\sc Inria} Sophia-Antipolis).
 Chapter~\ref{I1_ChapterAlphashapes3D}: 
 Tran Kai Frank Da ({\sc Inria} Sophia-Antipolis).
 
+\noindent
+Chapter~\ref{chapter-apollonius2}: Menelaos Karavelas, Mariette Yvinec ({\sc Inria} Sophia-Antipolis).
+
+
+
 \noindent
 Chapter~\ref{Optimisation}: Bernd G\"artner, Thomas Herrmann, Michael Hoffmann,
 Sven Sch\"onherr (ETH Z\"urich).
@@ -126,7 +131,6 @@ Chapter~\ref{Trees}: Gabriele Neyer (ETH Z\"urich); Andreas Fabri ({\sc Geometry
 
 \noindent
 Chapter~\ref{ChapterUserSpatialSearching}: Hans Tangelder (Utrecht University).
-ChapterUserSpatialSearching
 
 \section*{Acknowledgement}