diff --git a/doc/ext/plugin_reference.py b/doc/ext/plugin_reference.py
index 054e7642..44adc8bd 100644
--- a/doc/ext/plugin_reference.py
+++ b/doc/ext/plugin_reference.py
@@ -42,6 +42,15 @@ DATA = [
             }
         ]
     },
+    {
+        "group": "processing",
+        "items": [
+            {
+                "name": "output chart",
+                "base": "rally.task.processing.charts:OutputChart"
+            }
+        ]
+    },
     {
         "group": "deployment",
         "items": [