diff --git a/is/ub6/is6.pdf b/is/ub6/is6.pdf
index ff72162..e5c3cbb 100644
--- a/is/ub6/is6.pdf
+++ b/is/ub6/is6.pdf
Binary files differ
diff --git a/is/ub6/is6.tex b/is/ub6/is6.tex
index c7b5f55..f4b13a4 100644
--- a/is/ub6/is6.tex
+++ b/is/ub6/is6.tex
@@ -97,7 +97,7 @@
                 \node[circle, draw] (C) [below of=B] {C};
                 \node[circle, draw] (D) [below right of=B] {D};
 
-                \draw (B)--(D);
+                \draw (D)--(B);
                 \draw (A) -- (B);
                 \draw (C) -- (B) ;
             \end{tikzpicture}