#4361: fix string.py docstring, clarify that only ASCII characters are in its constants.
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 63caa4c..37704b0 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -71,7 +71,7 @@
 
 .. data:: whitespace
 
-   A string containing all characters that are considered whitespace.
+   A string containing all ASCII characters that are considered whitespace.
    This includes the characters space, tab, linefeed, return, formfeed, and
    vertical tab.