diff --git a/dom.bs b/dom.bs
index a313949c..6eefb816 100644
--- a/dom.bs
+++ b/dom.bs
@@ -943,7 +943,7 @@ when something has occurred.
 
 <ul class=brief>
  <li><dfn for="event listener">type</dfn> (a string)
- <li><dfn for="event listener">callback</dfn> (null or an {{EventListener}} object)
+ <li><dfn for="event listener" export>callback</dfn> (null or an {{EventListener}} object)
  <li><dfn for="event listener">capture</dfn> (a boolean, initially false)
  <li><dfn for="event listener">passive</dfn> (null or a boolean, initially null)
  <li><dfn for="event listener">once</dfn> (a boolean, initially false)