diff --git a/slides.tex b/slides.tex
index d7aee6dcfc617ce37458d9bc73f1643d44873e90..bdc3211ec1b353f6ccae899191b3e8a7cf7a9b0b 100644
--- a/slides.tex
+++ b/slides.tex
@@ -232,59 +232,60 @@ Problem
 
 \subsection{NixPkgs}
 
-\begin{frame}[fragile]{Packages repositories}
+\begin{frame}[fragile]{Package repositories}
+
+  Package definitions
   \begin{itemize}
-    \item Packages are source code
-    \item Decentralized repository
+    \item Source code (in Nix)
+    \item Stored in decentralized repositories
   \end{itemize}
 
   \vspace{1em}
-  Official Git Repository:
+  Official Git Repository: \textbf{NixPkgs}
   \begin{tcolorbox}[colframe=black,colback=gray!10,coltext=black]
     \center
     https://github.com/NixOS/nixpkgs \\
-    \textit{A.K.A} \textbf{NixPkgs}
   \end{tcolorbox}
 
   \begin{itemize}
-    \item Maintained by the community
+    \item Community maintained
     \item +10K packages
+    \item CI checked
+    \item Binary caches
   \end{itemize}
 
 \end{frame}
 
 \section{Experiment Reproducibility}
 
-\begin{frame}[fragile]{}
+\begin{frame}[fragile]{Conclusion}
 \begin{columns}
 \begin{column}{0.5\textwidth}
 Why it is reproducible ?
   \begin{itemize}
-  \item Package = traceable dependencies
+  \item Traceable dependencies
   \item Automated package build
-  \item fixed application source
-  \item pinned Nixpkgs
+  \item Fixed application source
+  \item Pinned Nixpkgs
   \end{itemize}
 \end{column}
 \begin{column}{0.5\textwidth}  %%<--- here
 Limitations
   \begin{itemize}
     \item No kernel version control
-    \item Require deterministic build process
-    \item Can depends on external dependencies
+    \item Require deterministic build
+    \item External storage (github, gitlab,  )
   \end{itemize}
 \end{column}
 \end{columns}
 
-\end{frame}
+  \vspace{1em}
 
-\begin{frame}[fragile,noframenumbering]
-  \center
-  Thanks.
   \begin{tcolorbox}[colframe=black,colback=gray!10,coltext=black]
     \center
     https://mpoquet.gitlabpages.inria.fr/nix-tutorial/
   \end{tcolorbox}
+
 \end{frame}
 
 \appendix