diff --git a/base.js b/base.js
index cd20236..c4d76ec 100644
--- a/base.js
+++ b/base.js
@@ -241,6 +241,11 @@
         trigger.focus();
       }
     }
+    // Announce the close so whoever opened the modal can undo optimistic UI or
+    // clean up a dynamically-inserted overlay. A modal can be dismissed four
+    // ways — the ✕ button, a Cancel button, a backdrop click, and Escape — and
+    // the last two are handled globally here, so button-only listeners miss them.
+    el.dispatchEvent(new CustomEvent('lt:modalclose', { bubbles: true }));
   }
 
   function closeAllModals() {