diff --git a/tools/extract/liftOver_wrapper.xml b/tools/extract/liftOver_wrapper.xml
index e539c9ac1a7..b5709a65e3a 100644
--- a/tools/extract/liftOver_wrapper.xml
+++ b/tools/extract/liftOver_wrapper.xml
@@ -62,6 +62,7 @@
ucsc_tools
+
.. class:: warningmark