diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index b237d52c3e75b5..55bae3df25e495 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1025,7 +1025,7 @@ series of :term:`arguments <argument>`:
                 :   ["," `keywords_arguments`]
                 : | `starred_and_keywords` ["," `keywords_arguments`]
                 : | `keywords_arguments`
-   positional_arguments: positional_item ("," positional_item)*
+   positional_arguments: `positional_item` ("," `positional_item`)*
    positional_item: `assignment_expression` | "*" `expression`
    starred_and_keywords: ("*" `expression` | `keyword_item`)
                 : ("," "*" `expression` | "," `keyword_item`)*