--- a/servo/components/style/stylist.rs
+++ b/servo/components/style/stylist.rs
@@ -1139,18 +1139,18 @@ impl Stylist {
         let mut dummy_flag_setter = |_: &E, _: ElementSelectorFlags| {};
 
         let map = match self.get_map(pseudo_element) {
             Some(map) => map,
             None => return,
         };
         let rule_hash_target = element.rule_hash_target();
 
-        // nsXBLPrototypeResources::ComputeServoStyleSet() added XBL stylesheets under author
-        // (doc) level.
+        // nsXBLPrototypeResources::LoadResources() loads Chrome XBL style
+        // sheets under eAuthorSheetFeatures level.
         map.author.get_all_matching_rules(element,
                                           &rule_hash_target,
                                           applicable_declarations,
                                           &mut matching_context,
                                           self.quirks_mode,
                                           &mut dummy_flag_setter,
                                           CascadeLevel::XBL);
     }