add feature for issue #69
diff --git a/tests/visual_tests/.gitignore b/tests/visual_tests/.gitignore
index 7ea9e79..c861d1f 100644
--- a/tests/visual_tests/.gitignore
+++ b/tests/visual_tests/.gitignore
@@ -5,3 +5,4 @@
 *.log
 *.tex
 *.synctex.gz
+*.lot