diff --git a/complementary/ack/ack.tex b/complementary/ack/ack.tex
index 79cd2fc..9063055 100644
--- a/complementary/ack/ack.tex
+++ b/complementary/ack/ack.tex
@@ -10,13 +10,13 @@
 \usepackage{graphicx}
 \begin{document}
 
-\section{MISP Training Slide Decks}
+\section*{MISP Training Slide Decks}
 
 MISP\footnote{\url{https://www.misp-project.org/}} is a threat intelligence platform for gathering, sharing, storing and correlating Indicators of Compromise of targeted attacks, threat intelligence, financial fraud information, vulnerability information or even counter-terrorism information.
 
 This document includes the slides which are the support materials\footnote{\url{https://github.com/MISP/misp-training}} used for MISP trainings. The content is dual-licensed under CC-BY-SA version 4 license or GNU Affero General Public License version 3 which allows you to freely use, remixes and share-alike the slides while still mentioning the contributors under the same conditions.
 
-\section{Contributors}
+\section*{Contributors}
 
 \begin{itemize}
 \item Steve Clement \url{https://github.com/SteveClement}
@@ -28,7 +28,7 @@ This document includes the slides which are the support materials\footnote{\url{
 \item Gerard Wagener \url{https://github.com/haegardev}
 \end{itemize}
 
-\section{Acknowledgment}
+\section*{Acknowledgment}
 
 The MISP project is co-financed and resource supported by CIRCL Computer Incident Response Center Luxembourg\footnote{\url{https://www.circl.lu/}} and co-financed by a CEF (Connecting Europe Facility) funding under CEF-TC-2016-3 - Cyber Security as {\it Improving MISP as building blocks for next-generation information sharing}.