diff --git a/report.tex b/report.tex
index 43883bf..79f2734 100644
--- a/report.tex
+++ b/report.tex
@@ -843,6 +843,7 @@ $}
   \end{frame}
 
   \begin{frame}{Searching for a first order Z4c}{Introducing Mathematica into workflow}
+    \subsection{Introducing Mathematica into workflow}
     To speed up the process and reduce the chance of making mistakes, I wrote a Mathematica notebook using a package \texttt{MathGR}.
 
     \texttt{MathGR} can do symbolic tensor calculations, and render tensor equations in a readable way:
@@ -865,6 +866,7 @@ $}
   \end{frame}
 
   \begin{frame}{Searching for a first order Z4c}{Current status}
+    \section{Current status}
     \begin{itemize}
       \item What we have:
       \begin{itemize}