diff --git a/notebook/static/notebook/js/outputarea.js b/notebook/static/notebook/js/outputarea.js
index 226d72114..873cd01f8 100644
--- a/notebook/static/notebook/js/outputarea.js
+++ b/notebook/static/notebook/js/outputarea.js
@@ -335,6 +335,11 @@ define([
         if (record_output) {
             this.outputs.push(json);
         }
+
+        this.events.trigger('output_added.OutputArea', {
+            output: json,
+            output_area: this,
+        });
     };
 
     OutputArea.prototype.handle_appended = function () {