* This should consist of alphanumberic, '-', and '_' characters.
* This name should not be changed after use.
* 'wikiId' : Prefix to container names that is unique to this wiki.
- * This should consist of alphanumberic, '-', and '_' characters.
+ * It should only consist of alphanumberic, '-', and '_' characters.
* 'lockManager' : Registered name of a file lock manager to use.
+ * 'fileJournal' : File journal configuration; see FileJournal::factory().
+ * Journals simply log changes to files stored in the backend.
* 'readOnly' : Write operations are disallowed if this is a non-empty string.
* It should be an explanation for the backend being read-only.
*