diff --git a/layout.sty b/layout.sty
index b94b84a184917fe9e117fba988964a00a80f968f..9068587dc5eea2968810b6d428756d2cf894494b 100644
--- a/layout.sty
+++ b/layout.sty
@@ -42,6 +42,7 @@
   \usetikzlibrary{intersections}% for very fancy borders with intersecting lines
   \usetikzlibrary{decorations.text}% for text along circle paths in cs
   \usetikzlibrary{shapes.misc}% for very fancy \section
+  \usetikzlibrary{shapes.callouts}% for labels on the cs
   \usetikzlibrary{patterns}% for the pattern 'gridspecks'
 \RequirePackage{pifont}
 \RequirePackage{colortbl}