diff --git a/img/graphviz-fail/.gitignore b/img/graphviz-fail/.gitignore
new file mode 100644
index 0000000..a136337
--- /dev/null
+++ b/img/graphviz-fail/.gitignore
@@ -0,0 +1 @@
+*.pdf
diff --git a/img/graphviz-fail/Makefile b/img/graphviz-fail/Makefile
new file mode 100644
index 0000000..2b5eba4
--- /dev/null
+++ b/img/graphviz-fail/Makefile
@@ -0,0 +1,4 @@
+all: dot.pdf neato.pdf circo.pdf sfdp.pdf fdp.pdf twopi.pdf
+
+%.pdf: source.dot
+	$* -Tpdf -o$@ $<
diff --git a/img/graphviz-fail/source.dot b/img/graphviz-fail/source.dot
new file mode 100644
index 0000000..8af8b58
--- /dev/null
+++ b/img/graphviz-fail/source.dot
@@ -0,0 +1,16 @@
+graph "This is not good" {
+	rou_x -- {net_7 net_6};
+	rou_a -- {net_6 net_4};
+	rou_b -- {net_6 net_5};
+	rou_c -- {net_4 net_2};
+	rou_d -- {net_4 net_3};
+	rou_e -- {net_5 net_2};
+	rou_f -- {net_5 net_3};
+	rou_g -- {net_3 net_1};
+	rou_h -- {net_2 net_1};
+	rou_i -- {net_1};
+	pm -- {internet vl16};
+	qs -- {internet vl16};
+	tr -- {internet vl15 vl16 vl2 vl42};
+	zr -- {net_7 vl101 vl16};
+}