diff --git a/docs/plugin_api.rst b/docs/plugin_api.rst
index c6e61a9f8d..f87179ce36 100644
--- a/docs/plugin_api.rst
+++ b/docs/plugin_api.rst
@@ -13,3 +13,5 @@ For example:
   plugin = viz.plugins['Plot Options']
   plugin.open_in_tray()
   plugin.show('popout')
+
+Some plugins provide API hints directly in the UI.  To enable these, toggle the ``<>`` button in the top of the plugin.
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