diff --git a/qutebrowser/config/configdata.py b/qutebrowser/config/configdata.py
index bcad53e00..3e0a6d8b1 100644
--- a/qutebrowser/config/configdata.py
+++ b/qutebrowser/config/configdata.py
@@ -54,7 +54,12 @@ class Option:
 @attr.s
 class Migrations:
 
-    """Nigrated options in configdata.yml."""
+    """Nigrated options in configdata.yml.
+
+    Attributes:
+        renamed: A dict mapping old option names to new names.
+        deleted: A list of option names which have been removed.
+    """
 
     renamed = attr.ib(default=attr.Factory(dict))
     deleted = attr.ib(default=attr.Factory(list))