diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index fe78be78420..7338f952549 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -892,7 +892,7 @@ string functions based on regular expressions.
    found.
 
 
-.. method:: str.format(format_string, *args, **kwargs)
+.. method:: str.format(*args, **kwargs)
 
    Perform a string formatting operation.  The *format_string* argument can
    contain literal text or replacement fields delimited by braces ``{}``.  Each