diff --git a/sections/semisimple-algebras.tex b/sections/semisimple-algebras.tex
@@ -314,9 +314,17 @@ implies\dots
|- (X.center) \tikztonodes
-| ([xshift=-2ex]\tikztotarget.west)
-- (\tikztotarget)}]{dll}[at end]{} \\ &
- H^1(\mathfrak{g}, W) \arrow[r] &
+ H^1(\mathfrak{g}, W) \arrow[r]\ar[draw=none]{d}[name=Y, anchor=center]{} &
H^1(\mathfrak{g}, V) \arrow[r] &
- H^1(\mathfrak{g}, U) \arrow[r, dashed] &
+ H^1(\mathfrak{g}, U)
+ \ar[rounded corners,
+ to path={ -- ([xshift=2ex]\tikztostart.east)
+ |- (Y.center) \tikztonodes
+ -| ([xshift=-2ex]\tikztotarget.west)
+ -- (\tikztotarget)}]{dll}[at end]{} \\ &
+ H^2(\mathfrak{g}, W) \arrow[r] &
+ H^2(\mathfrak{g}, V) \arrow[r] &
+ H^2(\mathfrak{g}, U) \arrow[r, dashed] &
\cdots
\end{tikzcd}
\end{center}