- * @param string $name Name being imported
- * @return string Name, possibly with the prefix prepended.
+ * This method does have a side-effect on SUL (single user login) wikis: Calling this calls the
+ * ImportHandleUnknownUser hook from the CentralAuth extension, which assigns a local ID to the
+ * global user name, if possible. No prefix is applied if this is successful.
+ *
+ * @see https://meta.wikimedia.org/wiki/Help:Unified_login
+ * @see https://www.mediawiki.org/wiki/Manual:Hooks/ImportHandleUnknownUser
+ *
+ * @param string $name
+ * @return string Either the unchanged username if it's a known local user (or not a valid
+ * username), otherwise the name with the prefix prepended.