diff --git a/examples/sierra-result.svg b/examples/sierra-result.svg
index 0a0b1e0..38e26f7 100644
--- a/examples/sierra-result.svg
+++ b/examples/sierra-result.svg
@@ -1,3 +1,3 @@
\ No newline at end of file
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
\ No newline at end of file