diff --git a/os_api_ref/assets/api-site.css b/os_api_ref/assets/api-site.css
index e7f5c19..d491df0 100644
--- a/os_api_ref/assets/api-site.css
+++ b/os_api_ref/assets/api-site.css
@@ -79,3 +79,7 @@ a.operation-anchor {
 .api-detail table.docutils {
     width: 100%;
 }
+
+.versionmodified {
+    font-weight: bold;
+}
\ No newline at end of file