diff --git a/.gitignore b/.gitignore
index 2321c4f..3814faa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@ plastex/
 gerby-website/
 document/*
 *.swp
+tags
+document.paux
diff --git a/configuration.py b/configuration.py
deleted file mode 100644
index e51247c..0000000
--- a/configuration.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# configuration for the website
-COMMENTS = "comments.sqlite"
-DATABASE = "hello-world.sqlite"
-UNIT = "section"
-DEPTH = 0
-
-# configuration for the import
-PATH = "document"
-PAUX = "document.paux"
-TAGS = "tags"
-PDF = ""
-
diff --git a/document.tex b/document.tex
index 481b9a1..ef3fb41 100644
--- a/document.tex
+++ b/document.tex
@@ -18,6 +18,8 @@
 
 \numberwithin{equation}{subsection}
 
+\newcommand{\hi}{gamer}
+
 \begin{document}
 
 \chapter{A first chapter}
@@ -28,8 +30,13 @@
 
 \begin{lemma}
   \label{lemma:pythagoras}
-  $a^2=b^2+c^2$
+  $a^2=b^2+c^2 \hello$
+\hi
 \end{lemma}
+\begin{proof}
+hihihihihihihi
+\[\xymatrix{ &  Y_1 &  \\  X \ar[ru]^{f_1} \ar[r]^{f_3} \ar[rd]_{f_2} &  Y_3 \ar[u]_{a_{31}} \ar[d]^{a_{32}} &  Y \ar[lu]_{s_1} \ar[l]_{s_3} \ar[ld]^{s_2} \\  &  Y_2 &  }\]
+\end{proof}
 
 \section{A second section}
 \label{section:second}
diff --git a/preamble.sty b/preamble.sty
new file mode 100644
index 0000000..3b26b52
--- /dev/null
+++ b/preamble.sty
@@ -0,0 +1 @@
+\newcommand{\hello}{hi}