spy: add "all" parameter (to also show inWaiting and empty read)
diff --git a/documentation/pyserial_api.rst b/documentation/pyserial_api.rst
index 692c65e..8630001 100644
--- a/documentation/pyserial_api.rst
+++ b/documentation/pyserial_api.rst
@@ -913,6 +913,8 @@
- ``color`` enable ANSI escape sequences to colorize output
- ``raw`` output the read and written data directly (default is to create a
hex dump). In this mode, no control line and other commands are logged.
+ - ``all`` also show ``inWaiting()`` and empty ``read()`` calls (hidden by
+ default because of high traffic).
Example::