diff --git a/ui/dr-ui/ui/toolrail.slint b/ui/dr-ui/ui/toolrail.slint
index da913f8..1753208 100644
--- a/ui/dr-ui/ui/toolrail.slint
+++ b/ui/dr-ui/ui/toolrail.slint
@@ -121,6 +121,26 @@ export component ToolRail inherits Rectangle {
                 root.picked(entry.on ? ViewMode.photo : tool.mode);
             }
 
+            // **The word below is drawn; this is what makes it a control.**
+            // Without these the rail reaches a screen reader as four pieces of
+            // static text — the labels get through, because a `Text` announces
+            // itself, and nothing says any of them can be pressed. That is the
+            // develop view's primary navigation reduced to a caption.
+            //
+            // `checkable` unconditionally, unlike `Button`'s: a rail entry is
+            // always a held-or-not state, so an unheld one should say "not
+            // pressed" rather than pass for an ordinary button. The action
+            // repeats the click handler rather than calling it, because a
+            // `TouchArea`'s `clicked` is raised by the pointer and cannot be
+            // raised from here.
+            accessible-role: button;
+            accessible-label: tool.label;
+            accessible-checkable: true;
+            accessible-checked: entry.on;
+            accessible-action-default => {
+                root.picked(entry.on ? ViewMode.photo : tool.mode);
+            }
+
             // The lit tile, and the only marker there is. Inset from the
             // rail's edges so the run of four reads as four things rather than
             // as one striped column.