diff --git a/docs/settings.rst b/docs/settings.rst
index 82752436..669b899f 100644
--- a/docs/settings.rst
+++ b/docs/settings.rst
@@ -201,6 +201,7 @@ Also, you can use other file metadata attributes as well:
 * lang
 * author
 * category
+* post_id
 
 Example usage: