diff --git a/add_number.py b/add_number.py
index 13a9977..63922ee 100755
--- a/add_number.py
+++ b/add_number.py
@@ -1,14 +1,19 @@
 #!/usr/bin/python3
+import sys
 
 import ox.api
 
-api = ox.api.signin('https://amp.0x2620.org/api/')
+site = sys.argv[1]
+prefix = 'cnv'
+api = ox.api.signin(site)
 
 n = 1
 for item in api.find({
-    'condtions': [{'key': 'title', 'value': 'cnv', '^'}],
+    'query': {
+        'conditions': [{'key': 'title', 'value': prefix, 'operator': '^'}]
+    },
     'keys': ['id', 'title'],
-    'sort': [{'key': 'created', 'order': '+'}],
+    'sort': [{'key': 'created', 'operator': '+'}],
     'range': [0, 10000]
 })['data']['items']:
     api.edit({
diff --git a/rename_document_series.py b/rename_document_series.py
new file mode 100755
index 0000000..d2a29b1
--- /dev/null
+++ b/rename_document_series.py
@@ -0,0 +1,29 @@
+#!/usr/bin/python3
+import sys
+import ox.api
+
+if len(sys.argv) != 4:
+    print('usage: %s <site> <old title prefix> <new title prefix>' % sys.argv[0])
+
+site = sys.argv[1]
+old_prefix = sys.argv[2]
+new_prefix = sys.argv[2]
+
+api = ox.api.signin(site)
+
+for item in api.findDocuments({
+    'query': {
+        'conditions': [{'key': 'title', 'value': old_prefix, 'operator': '='}]
+    },
+    'keys': ['id', 'title'],
+    'sort': [{'key': 'title', 'operator': '+'}],
+    'range': [0, 10000]
+})['data']['items']:
+    n = int(item['title'][3:])
+    new_title = '%s %s' % (new_prefix, n)
+    print(item['title'], '->', new_title)
+    api.editDocument({
+        'id': item['id'],
+        'title': new_title
+    })
+