diff --git a/pandora/app/documentation.py b/pandora/app/documentation.py
new file mode 100644
index 00000000..e189f230
--- /dev/null
+++ b/pandora/app/documentation.py
@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+from __future__ import print_function
+
+import re
+import ox.jsonc
+
+
+def get(config_jsonc='config.pandora.jsonc'):
+    with open(config_jsonc, 'rb') as fd:
+        data = fd.read().decode('utf-8')
+    config = ox.jsonc.loads(data)
+    docs = {}
+    for m in re.compile('(    \/\*.*?\*\/)\W+"([^\W]+?)":', re.DOTALL).findall(data):
+        docs[m[1]] = m[0].strip()
+    '''
+    for key in config:
+        if key not in docs:
+            print(config_jsonc, 'missing', key)
+    '''
+    for key in docs.keys():
+        if key not in config:
+            print('parse error, invalid config key:', key)
+            del docs[key]
+    return docs
+
+def update(config_jsonc='config.jsonc', base='config.pandora.jsonc'):
+    with open(config_jsonc, 'rb') as fd:
+        config = data = fd.read().decode('utf-8')
+    docs = get(base)
+    current_docs = get(config_jsonc)
+    for key in docs:
+        if key in current_docs:
+            match = re.escape('    '+docs[key]) + '\W+"' + re.escape(key) + '":'
+        else:
+            match = '    "' + re.escape(key) + '":'
+        data = re.sub(match, '    %s\n    "%s":' % (docs[key], key), data)
+    if data != config:
+        print('updating config documentation', config_jsonc)
+        with open('%s' % config_jsonc, 'wb') as fd:
+            fd.write(data.encode('utf-8'))
diff --git a/pandora/app/management/commands/update_config_documentation.py b/pandora/app/management/commands/update_config_documentation.py
new file mode 100644
index 00000000..8bbdc191
--- /dev/null
+++ b/pandora/app/management/commands/update_config_documentation.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+from __future__ import print_function
+from django.core.management.base import BaseCommand
+from django.conf import settings
+from ... import documentation
+
+
+class Command(BaseCommand):
+    """
+    """
+    help = 'update config.jsonc documentation'
+    args = '[config.jsonc] [baseconfig.jsonc]'
+
+    def handle(self, *args, **options):
+        target = settings.SITE_CONFIG
+        base = settings.DEFAULT_CONFIG
+        if len(args) == 1:
+            target = args[0]
+        elif len(args) == 2:
+            target = args[0]
+            base = args[1]
+        print('update docs', target, 'base', base)
+        documentation.update(target, base)