--- a/tools/docs/conf.py
+++ b/tools/docs/conf.py
@@ -41,16 +41,17 @@ extensions = [
     'mozbuild.sphinx',
     'sphinx_js',
 ]
 
 # JSDoc must run successfully for dirs specified, so running
 # tree-wide (the default) will not work currently.
 js_source_path = [
     'browser/components/extensions',
+    'testing/marionette',
     'toolkit/components/extensions',
     'toolkit/mozapps/extensions',
 ]
 root_for_relative_js_paths = '.'
 jsdoc_config_path = 'tools/docs/jsdoc.json'
 
 templates_path = ['_templates']
 source_suffix = '.rst'