diff --git a/layout.sty b/layout.sty
index 89a2883d71cfd11eb89b62ae9b7cf674b3495335..2d6fc863f41fc42d4aa21c2edfddc006e01ad07f 100644
--- a/layout.sty
+++ b/layout.sty
@@ -515,7 +515,7 @@ interior code={ \path[tcb fill interior] ([xshift=-2mm]interior.west)
 \renewcommand*{\thesection}{\arabic{section}}
 
 \titleformat{\subsection}
-{\needspace{7em}\normalfont\large\bfseries}{\thesubsection}{1em}{}
+{\needspace{7em}\normalfont\large\bfseries}{\thesubsection}{1em}{}[\titlerule\vspace{1ex}]
 
 %
 \titleformat{\subsubsection}