Fix Since tag.
diff --git a/glib/goption.h b/glib/goption.h
index 7a07901..198eebd 100644
--- a/glib/goption.h
+++ b/glib/goption.h
@@ -76,7 +76,7 @@
* It is not safe to use this option, unless all option groups are under
* your direct control. Since 2.8.
* @G_OPTION_FLAG_APPEND_EMPTY_LINE: This flag adds an empty line after the
- * one of the option, allowing to visually group options. Since: 2.63.1.
+ * one of the option, allowing to visually group options. Since: 2.64.
*
* Flags which modify individual options.
*/