From d5799377a2988796dcd8c47ff89819df5d23797e Mon Sep 17 00:00:00 2001
From: Dave Pearson <davep@davep.org>
Date: Tue, 23 May 2023 11:31:07 +0100
Subject: [PATCH] Document _selected

It's not for public consumption, but it's useful for anyone reading the code.
---
 src/textual/widgets/_selection_list.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/textual/widgets/_selection_list.py b/src/textual/widgets/_selection_list.py
index 732e97409..1075f4918 100644
--- a/src/textual/widgets/_selection_list.py
+++ b/src/textual/widgets/_selection_list.py
@@ -208,6 +208,7 @@ class SelectionList(Generic[SelectionType], OptionList):
             disabled: Whether the selection list is disabled or not.
         """
         self._selected: dict[SelectionType, None] = {}
+        """Tracking of which values are selected."""
         super().__init__(
             *[self._make_selection(selection) for selection in selections],
             name=name,