diff --git a/cours/cours_prof.cls b/cours/cours_prof.cls
index 12acbdb..3f2b5e1 100644
--- a/cours/cours_prof.cls
+++ b/cours/cours_prof.cls
@@ -158,6 +158,7 @@
     frametitlealignment=\raggedright,%
     innerbottommargin=2em,%
 }
+% styles
 \tikzset{
     symbol/.style={
         rectangle, draw=white,