put PYTHONIOENCODING in man page
diff --git a/Misc/python.man b/Misc/python.man
index 157d9d7..428ef4d 100644
--- a/Misc/python.man
+++ b/Misc/python.man
@@ -384,9 +384,18 @@
.IP PYTHONINSPECT
If this is set to a non-empty string it is equivalent to specifying
the \fB\-i\fP option.
+.IP PYTHONIOENCODING
+If this is set before running the interpreter, it overrides the encoding used
+for stdin/stdout/stderr, in the syntax
+.IB encodingname ":" errorhandler
+The
+.IB errorhandler
+part is optional and has the same meaning as in str.encode. For stderr, the
+.IB errorhandler
+ part is ignored; the handler will always be \'backslashreplace\'.
.IP PYTHONNOUSERSITE
-If this is set to a non-empty string it is equivalent to specifying
-the \fB\-s\fP option (Don't add the user site directory to sys.path).
+If this is set to a non-empty string it is equivalent to specifying the
+\fB\-s\fP option (Don't add the user site directory to sys.path).
.IP PYTHONUNBUFFERED
If this is set to a non-empty string it is equivalent to specifying
the \fB\-u\fP option.