diff --git a/core-collapse.html b/core-collapse.html
index 6d7f5b0..2c4affd 100644
--- a/core-collapse.html
+++ b/core-collapse.html
@@ -76,7 +76,7 @@
      * opened. If unspecified, the `core-collapse` itself is the target.
      *
      * @attribute target
-     * @type object
+     * @type Object
      * @default null
      */
     target: null,