Issue #22820: Explain need for *print* when running file from Idle editor.
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index bbbeaa2..c149aa9 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -206,7 +206,12 @@
Run Module
Do Check Module (above). If no error, restart the shell to clean the
- environment, then execute the module.
+ environment, then execute the module. Output is displayed in the Shell
+ window. Note that output requires use of ``print`` or ``write``.
+ When execution is complete, the Shell retains focus and displays a prompt.
+ At this point, one may interactively explore the result of execution.
+ This is similar to executing a file with ``python -i file`` at a command
+ line.
Shell menu (Shell window only)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^