diff --git a/Manual_tools/src/latex_converter_config/html/Biblio/how_to_cite_cgal.bib b/Manual_tools/src/latex_converter_config/html/Biblio/how_to_cite_cgal.bib
index 5cb32d7455f..ec695a2f338 100644
--- a/Manual_tools/src/latex_converter_config/html/Biblio/how_to_cite_cgal.bib
+++ b/Manual_tools/src/latex_converter_config/html/Biblio/how_to_cite_cgal.bib
@@ -80,7 +80,7 @@
 }
 
 @INCOLLECTION{cgal:h-ma-11b,
-   AUTHOR       = {Michael Hemmer},
+   AUTHOR       = {Michael Hemmer and Sylvain Pion},
    BOOKTITLE    = {{CGAL} User and Reference Manual},
    PUBLISHER    = {{CGAL Editorial Board}},
    TITLE        = {Modular Arithmetic},
diff --git a/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex b/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex
index 4925d41bf8c..2ab092ad684 100644
--- a/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex
+++ b/Modular_arithmetic/doc_tex/Modular_arithmetic/main.tex
@@ -1,6 +1,6 @@
 \cleardoublepage
 \ccUserChapter{Modular Arithmetic\label{chap:modular_arithmetic}}
-\ccChapterAuthor{Michael Hemmer}
+\ccChapterAuthor{Michael Hemmer \and Sylvain Pion}
 
 \input{Modular_arithmetic/PkgDescription.tex}