Document the 'line' argument
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index 87c4fd6..888cb84 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -218,6 +218,9 @@
resulting string to *file*, which defaults to ``sys.stderr``. You may replace
this function with an alternative implementation by assigning to
``warnings.showwarning``.
+ *line* is a line of source code to be included in the warning
+ message; if *line* is not supplied, :func:`showwarning` will
+ try to read the line specified by *filename* and *lineno*.
.. versionchanged:: 2.6
Added the *line* argument. Implementations that lack the new argument
@@ -227,7 +230,9 @@
.. function:: formatwarning(message, category, filename, lineno[, line])
Format a warning the standard way. This returns a string which may contain
- embedded newlines and ends in a newline.
+ embedded newlines and ends in a newline. *line* is
+ a line of source code to be included in the warning message; if *line* is not supplied,
+ :func:`formatwarning` will try to read the line specified by *filename* and *lineno*.
.. versionchanged:: 2.6
Added the *line* argument.