jsconf.diff

diff --git a/sphinx_js/__init__.py b/sphinx_js/__init__.py
index 7f2e6b4..09073c3 100644
--- a/sphinx_js/__init__.py
+++ b/sphinx_js/__init__.py
@@ -24,6 +24,7 @@ def setup(app):
     # TODO: We could add a js:module with app.add_directive_to_domain().
 
     app.add_config_value('js_source_path', '../', 'env')
+    app.add_config_value('js_config_path', None, 'env')
 
 
 def read_all_docs(app, env, doc_names):
diff --git a/sphinx_js/jsdoc.py b/sphinx_js/jsdoc.py
index cb34875..7b73f56 100644
--- a/sphinx_js/jsdoc.py
+++ b/sphinx_js/jsdoc.py
@@ -5,7 +5,10 @@ from subprocess import check_output
 def run_jsdoc(app):
     """Run JSDoc across a whole codebase, and squirrel away its results."""
     # JSDoc defaults to utf8-encoded output.
-    doclets = loads(check_output(['jsdoc', app.config.js_source_path, '-X']).decode('utf8'))
+    jsdoc_command = ['jsdoc', app.config.js_source_path, '-X']
+    if app.config.js_config_path:
+        jsdoc_command.extend(['-c', app.config.js_config_path])
+    doclets = loads(check_output(jsdoc_command).decode('utf8'))
     app._sphinxjs_jsdoc_output = dict((d['longname'], d) for d in doclets
                                       if d.get('comment')
                                       and not d.get('undocumented'))