diff --git a/docs/traceability.md b/docs/traceability.md
index be39ca3..4944373 100644
--- a/docs/traceability.md
+++ b/docs/traceability.md
@@ -10,7 +10,7 @@ Denominators are parsed from [`requirements.md`](requirements.md) at run time, n
 | Metric | Value |
 |---|---|
 | Source files scanned | 265 |
-| TRACES tags found | 762 |
+| TRACES tags found | 765 |
 | Requirements defined | 177 |
 | Requirements covered | 102 |
 | **Coverage** | **57.6%** (102/177) |
@@ -73,7 +73,7 @@ _None._
 | FR-DSP-1 | [`core/dr-gpu/src/adjust.rs:2088`](../core/dr-gpu/src/adjust.rs#L2088), [`core/dr-gpu/src/adjust.rs:2165`](../core/dr-gpu/src/adjust.rs#L2165), [`core/dr-gpu/src/adjust.rs:2250`](../core/dr-gpu/src/adjust.rs#L2250), [`core/dr-gpu/src/adjust.rs:54`](../core/dr-gpu/src/adjust.rs#L54), [`core/dr-gpu/src/adjust.rs:770`](../core/dr-gpu/src/adjust.rs#L770), [`core/dr-gpu/src/lib.rs:54`](../core/dr-gpu/src/lib.rs#L54), [`core/dr-gpu/src/lib.rs:94`](../core/dr-gpu/src/lib.rs#L94), [`core/dr-gpu/tests/capture_sharpen.rs:200`](../core/dr-gpu/tests/capture_sharpen.rs#L200), [`core/dr-gpu/tests/detail_stage.rs:328`](../core/dr-gpu/tests/detail_stage.rs#L328), [`core/dr-gpu/tests/local_contrast.rs:263`](../core/dr-gpu/tests/local_contrast.rs#L263), [`core/dr-gpu/tests/noise_reduction.rs:378`](../core/dr-gpu/tests/noise_reduction.rs#L378), [`core/dr-pipeline/src/detail.rs:136`](../core/dr-pipeline/src/detail.rs#L136), [`core/dr-pipeline/src/detail.rs:465`](../core/dr-pipeline/src/detail.rs#L465), [`core/dr-pipeline/src/graph.rs:543`](../core/dr-pipeline/src/graph.rs#L543), [`core/dr-pipeline/src/graph.rs:573`](../core/dr-pipeline/src/graph.rs#L573), [`core/dr-pipeline/src/ops/capture_sharpen.rs:1`](../core/dr-pipeline/src/ops/capture_sharpen.rs#L1), [`core/dr-pipeline/src/ops/capture_sharpen.rs:654`](../core/dr-pipeline/src/ops/capture_sharpen.rs#L654), [`core/dr-pipeline/src/ops/local_contrast.rs:1`](../core/dr-pipeline/src/ops/local_contrast.rs#L1), [`core/dr-pipeline/src/ops/local_contrast.rs:662`](../core/dr-pipeline/src/ops/local_contrast.rs#L662), [`core/dr-pipeline/src/ops/noise_reduction.rs:695`](../core/dr-pipeline/src/ops/noise_reduction.rs#L695), [`core/dr-pipeline/src/spot.rs:673`](../core/dr-pipeline/src/spot.rs#L673), [`ui/dr-ui/src/develop.rs:2668`](../ui/dr-ui/src/develop.rs#L2668), [`ui/dr-ui/src/develop.rs:3694`](../ui/dr-ui/src/develop.rs#L3694), [`ui/dr-ui/src/develop.rs:4177`](../ui/dr-ui/src/develop.rs#L4177), [`ui/dr-ui/src/develop.rs:4211`](../ui/dr-ui/src/develop.rs#L4211), [`ui/dr-ui/src/lib.rs:71`](../ui/dr-ui/src/lib.rs#L71), [`ui/dr-ui/src/lib.rs:737`](../ui/dr-ui/src/lib.rs#L737), [`ui/dr-ui/src/lib.rs:796`](../ui/dr-ui/src/lib.rs#L796) |
 | FR-DSP-6 | [`core/dr-pipeline/src/operation.rs:446`](../core/dr-pipeline/src/operation.rs#L446), [`core/dr-types/src/colour.rs:1`](../core/dr-types/src/colour.rs#L1), [`ui/dr-ui/src/develop.rs:2698`](../ui/dr-ui/src/develop.rs#L2698), [`ui/dr-ui/src/develop.rs:5469`](../ui/dr-ui/src/develop.rs#L5469), [`ui/dr-ui/src/lib.rs:1414`](../ui/dr-ui/src/lib.rs#L1414), [`ui/dr-ui/src/lib.rs:2626`](../ui/dr-ui/src/lib.rs#L2626) |
 | FR-DSP-7 | [`core/dr-gpu/src/histogram.rs:147`](../core/dr-gpu/src/histogram.rs#L147), [`core/dr-gpu/src/histogram.rs:1`](../core/dr-gpu/src/histogram.rs#L1), [`core/dr-gpu/src/histogram.rs:281`](../core/dr-gpu/src/histogram.rs#L281), [`core/dr-gpu/src/histogram.rs:50`](../core/dr-gpu/src/histogram.rs#L50), [`core/dr-gpu/src/shaders/histogram.wgsl:1`](../core/dr-gpu/src/shaders/histogram.wgsl#L1), [`ui/dr-ui/src/develop.rs:2747`](../ui/dr-ui/src/develop.rs#L2747), [`ui/dr-ui/src/develop.rs:5279`](../ui/dr-ui/src/develop.rs#L5279), [`ui/dr-ui/src/develop.rs:5311`](../ui/dr-ui/src/develop.rs#L5311), [`ui/dr-ui/src/develop.rs:621`](../ui/dr-ui/src/develop.rs#L621), [`ui/dr-ui/src/histogram.rs:1`](../ui/dr-ui/src/histogram.rs#L1), [`ui/dr-ui/src/lib.rs:1514`](../ui/dr-ui/src/lib.rs#L1514), [`ui/dr-ui/src/lib.rs:297`](../ui/dr-ui/src/lib.rs#L297), [`ui/dr-ui/ui/app.slint:299`](../ui/dr-ui/ui/app.slint#L299), [`ui/dr-ui/ui/histogram.slint:122`](../ui/dr-ui/ui/histogram.slint#L122), [`ui/dr-ui/ui/histogram.slint:1`](../ui/dr-ui/ui/histogram.slint#L1) |
-| FR-DSP-8 | [`platform/dr-plat/src/display.rs:1`](../platform/dr-plat/src/display.rs#L1), [`platform/dr-plat/src/display/icc.rs:1`](../platform/dr-plat/src/display/icc.rs#L1), [`platform/dr-plat/src/display/wayland.rs:1`](../platform/dr-plat/src/display/wayland.rs#L1), [`platform/dr-plat/src/display/x11.rs:1`](../platform/dr-plat/src/display/x11.rs#L1), [`ui/dr-ui/src/develop.rs:2644`](../ui/dr-ui/src/develop.rs#L2644), [`ui/dr-ui/src/develop.rs:2698`](../ui/dr-ui/src/develop.rs#L2698), [`ui/dr-ui/src/develop.rs:5469`](../ui/dr-ui/src/develop.rs#L5469), [`ui/dr-ui/src/develop.rs:5515`](../ui/dr-ui/src/develop.rs#L5515), [`ui/dr-ui/src/develop.rs:5534`](../ui/dr-ui/src/develop.rs#L5534), [`ui/dr-ui/src/develop.rs:689`](../ui/dr-ui/src/develop.rs#L689), [`ui/dr-ui/src/display_ui.rs:1`](../ui/dr-ui/src/display_ui.rs#L1), [`ui/dr-ui/src/display_ui.rs:258`](../ui/dr-ui/src/display_ui.rs#L258), [`ui/dr-ui/src/lib.rs:1388`](../ui/dr-ui/src/lib.rs#L1388), [`ui/dr-ui/src/lib.rs:1414`](../ui/dr-ui/src/lib.rs#L1414), [`ui/dr-ui/src/lib.rs:2603`](../ui/dr-ui/src/lib.rs#L2603), [`ui/dr-ui/src/lib.rs:2626`](../ui/dr-ui/src/lib.rs#L2626), [`ui/dr-ui/ui/app.slint:1708`](../ui/dr-ui/ui/app.slint#L1708), [`ui/dr-ui/ui/app.slint:278`](../ui/dr-ui/ui/app.slint#L278), [`ui/dr-ui/ui/settings.slint:120`](../ui/dr-ui/ui/settings.slint#L120), [`ui/dr-ui/ui/settings.slint:730`](../ui/dr-ui/ui/settings.slint#L730) |
+| FR-DSP-8 | [`platform/dr-plat/src/display.rs:1`](../platform/dr-plat/src/display.rs#L1), [`platform/dr-plat/src/display/icc.rs:1`](../platform/dr-plat/src/display/icc.rs#L1), [`platform/dr-plat/src/display/wayland.rs:1`](../platform/dr-plat/src/display/wayland.rs#L1), [`platform/dr-plat/src/display/x11.rs:1`](../platform/dr-plat/src/display/x11.rs#L1), [`ui/dr-ui/src/develop.rs:2644`](../ui/dr-ui/src/develop.rs#L2644), [`ui/dr-ui/src/develop.rs:2698`](../ui/dr-ui/src/develop.rs#L2698), [`ui/dr-ui/src/develop.rs:5469`](../ui/dr-ui/src/develop.rs#L5469), [`ui/dr-ui/src/develop.rs:5515`](../ui/dr-ui/src/develop.rs#L5515), [`ui/dr-ui/src/develop.rs:5534`](../ui/dr-ui/src/develop.rs#L5534), [`ui/dr-ui/src/develop.rs:689`](../ui/dr-ui/src/develop.rs#L689), [`ui/dr-ui/src/display_ui.rs:192`](../ui/dr-ui/src/display_ui.rs#L192), [`ui/dr-ui/src/display_ui.rs:1`](../ui/dr-ui/src/display_ui.rs#L1), [`ui/dr-ui/src/display_ui.rs:325`](../ui/dr-ui/src/display_ui.rs#L325), [`ui/dr-ui/src/display_ui.rs:346`](../ui/dr-ui/src/display_ui.rs#L346), [`ui/dr-ui/src/display_ui.rs:379`](../ui/dr-ui/src/display_ui.rs#L379), [`ui/dr-ui/src/lib.rs:1388`](../ui/dr-ui/src/lib.rs#L1388), [`ui/dr-ui/src/lib.rs:1414`](../ui/dr-ui/src/lib.rs#L1414), [`ui/dr-ui/src/lib.rs:2603`](../ui/dr-ui/src/lib.rs#L2603), [`ui/dr-ui/src/lib.rs:2626`](../ui/dr-ui/src/lib.rs#L2626), [`ui/dr-ui/ui/app.slint:1708`](../ui/dr-ui/ui/app.slint#L1708), [`ui/dr-ui/ui/app.slint:278`](../ui/dr-ui/ui/app.slint#L278), [`ui/dr-ui/ui/settings.slint:120`](../ui/dr-ui/ui/settings.slint#L120), [`ui/dr-ui/ui/settings.slint:730`](../ui/dr-ui/ui/settings.slint#L730) |
 | FR-EXP-1 | [`core/dr-export/src/encode.rs:1`](../core/dr-export/src/encode.rs#L1), [`core/dr-export/src/lib.rs:1`](../core/dr-export/src/lib.rs#L1), [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
 | FR-EXP-2 | [`core/dr-export/src/encode.rs:1`](../core/dr-export/src/encode.rs#L1), [`core/dr-export/src/error.rs:26`](../core/dr-export/src/error.rs#L26), [`core/dr-export/src/icc.rs:1`](../core/dr-export/src/icc.rs#L1), [`core/dr-export/src/lib.rs:153`](../core/dr-export/src/lib.rs#L153), [`core/dr-export/src/lib.rs:1`](../core/dr-export/src/lib.rs#L1), [`core/dr-export/src/lib.rs:53`](../core/dr-export/src/lib.rs#L53), [`core/dr-gpu/src/adjust.rs:2398`](../core/dr-gpu/src/adjust.rs#L2398), [`core/dr-pipeline/src/graph.rs:533`](../core/dr-pipeline/src/graph.rs#L533), [`core/dr-pipeline/src/graph.rs:587`](../core/dr-pipeline/src/graph.rs#L587), [`core/dr-pipeline/src/operation.rs:446`](../core/dr-pipeline/src/operation.rs#L446), [`core/dr-types/src/colour.rs:1`](../core/dr-types/src/colour.rs#L1), [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`core/dr-types/src/settings.rs:595`](../core/dr-types/src/settings.rs#L595), [`ui/dr-ui/src/develop.rs:5534`](../ui/dr-ui/src/develop.rs#L5534), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
 | FR-EXP-3 | [`core/dr-export/src/lib.rs:1`](../core/dr-export/src/lib.rs#L1), [`core/dr-export/src/size.rs:1`](../core/dr-export/src/size.rs#L1), [`core/dr-export/src/size.rs:25`](../core/dr-export/src/size.rs#L25), [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
diff --git a/ui/dr-ui/src/display_ui.rs b/ui/dr-ui/src/display_ui.rs
index 91eb1a8..012f3f6 100644
--- a/ui/dr-ui/src/display_ui.rs
+++ b/ui/dr-ui/src/display_ui.rs
@@ -142,32 +142,14 @@ impl DisplayWatch {
         physical(self.logical_canvas.get(), window.window().scale_factor())
     }
 
-    /// Push the three About-page readouts.
+    /// Push the About-page readouts.
     fn publish(&self, window: &AppWindow) {
-        let survey = self.survey.borrow();
-        let index = self.current.get();
-        let here = survey
-            .displays
-            .get(index)
-            .or_else(|| survey.displays.first());
-        let Some(here) = here else { return };
-
-        window.set_display_name(format!("{} ({})", here.name, survey.server.label()).into());
-        window.set_display_colour(here.profile.describe().into());
-
-        // The other monitors, listed rather than hidden. FR-DSP-8 is a
-        // multi-monitor requirement and the failure it names — the second
-        // display showing wrong colours — is invisible from the first, so a
-        // page that described only the display it was being read on would
-        // report nothing about the case that matters.
-        let others: Vec<String> = survey
-            .displays
-            .iter()
-            .enumerate()
-            .filter(|(i, _)| *i != index)
-            .map(|(_, d)| format!("{}: {}", d.name, d.profile.describe()))
-            .collect();
-        window.set_display_others(others.join(" · ").into());
+        let Some(readouts) = readouts(&self.survey.borrow(), self.current.get()) else {
+            return;
+        };
+        window.set_display_name(readouts.name.into());
+        window.set_display_colour(readouts.colour.into());
+        window.set_display_others(readouts.others.into());
     }
 
     /// Re-ask the platform and re-resolve which display is showing the canvas.
@@ -200,6 +182,55 @@ impl DisplayWatch {
     }
 }
 
+/// The three strings the About page shows about the session's colour path.
+pub(crate) struct Readouts {
+    pub name: String,
+    pub colour: String,
+    pub others: String,
+}
+
+/// TRACES: FR-DSP-8
+/// Turn a survey into what the About page says.
+///
+/// A free function over the survey rather than a method that writes into the
+/// window, because the requirement's visibility clause is the part worth
+/// asserting: FR-DSP-8 asks for a fallback that is *defined*, and a reason
+/// that reaches the code but never the screen satisfies half of that. This is
+/// where a test can hold the strings.
+///
+/// `None` only for a survey with no displays at all, which `probe` does not
+/// produce.
+pub(crate) fn readouts(survey: &DisplaySurvey, index: usize) -> Option<Readouts> {
+    // Clamped rather than indexed: a monitor unplugged between the survey and
+    // this call leaves an index pointing past the end, and the page must
+    // describe *a* display rather than nothing.
+    let index = if index < survey.displays.len() {
+        index
+    } else {
+        0
+    };
+    let here = survey.displays.get(index)?;
+
+    // The other monitors, listed rather than hidden. FR-DSP-8 is a
+    // multi-monitor requirement and the failure it names — the second display
+    // showing wrong colours — is invisible from the first, so a page that
+    // described only the display it was being read on would report nothing
+    // about the case that matters.
+    let others: Vec<String> = survey
+        .displays
+        .iter()
+        .enumerate()
+        .filter(|(i, _)| *i != index)
+        .map(|(_, d)| format!("{}: {}", d.name, d.profile.describe()))
+        .collect();
+
+    Some(Readouts {
+        name: format!("{} ({})", here.name, survey.server.label()),
+        colour: here.profile.describe(),
+        others: others.join(" · "),
+    })
+}
+
 /// Start following the window's display, and answer once immediately.
 ///
 /// `redraw` is the window's ordinary re-render, so a display change costs
@@ -254,6 +285,96 @@ pub(crate) fn attach(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use dr_plat::{Bounds, DisplayInfo, DisplayProfile, DisplayServer, FallbackReason};
+
+    fn two_monitors() -> DisplaySurvey {
+        DisplaySurvey {
+            server: DisplayServer::X11,
+            displays: vec![
+                DisplayInfo {
+                    name: "eDP-1".to_string(),
+                    bounds: Some(Bounds {
+                        x: 0,
+                        y: 0,
+                        width: 1920,
+                        height: 1200,
+                    }),
+                    profile: DisplayProfile::fallback(FallbackReason::NoWaylandProtocol),
+                },
+                DisplayInfo {
+                    name: "DP-2".to_string(),
+                    bounds: Some(Bounds {
+                        x: 1920,
+                        y: 0,
+                        width: 2560,
+                        height: 1440,
+                    }),
+                    profile: DisplayProfile {
+                        space: dr_types::ColourSpace::DisplayP3,
+                        source: dr_plat::ProfileSource::X11RootProperty(
+                            "_ICC_PROFILE_1".to_string(),
+                        ),
+                        described_as: Some("EIZO CG279X".to_string()),
+                        approximated: true,
+                    },
+                },
+            ],
+        }
+    }
+
+    /// TRACES: FR-DSP-8
+    /// The fallback is defined *and visible*, which is what the requirement
+    /// asks for and the half that is easy to leave out.
+    #[test]
+    fn the_about_page_says_which_acquisition_path_the_session_is_on() {
+        let survey = two_monitors();
+        let shown = readouts(&survey, 0).expect("a display");
+
+        assert!(shown.name.contains("eDP-1"), "{}", shown.name);
+        assert!(shown.name.contains("X11"), "{}", shown.name);
+        // A photographer being shown sRGB because the compositor would not say
+        // otherwise must be able to find that out rather than wonder.
+        assert!(shown.colour.contains("sRGB"), "{}", shown.colour);
+        assert!(shown.colour.contains("assumed"), "{}", shown.colour);
+        assert!(
+            shown.colour.contains("colour management"),
+            "the reason for the fallback did not reach the page: {}",
+            shown.colour
+        );
+    }
+
+    /// TRACES: FR-DSP-8
+    /// The second monitor is described on the page read on the first.
+    ///
+    /// The requirement's whole subject is the display the reader is *not*
+    /// looking at: "showing wrong colours on the second display is a
+    /// correctness defect". A page that listed only the current one would say
+    /// nothing about the case it exists for.
+    #[test]
+    fn the_other_monitor_is_named_on_the_page_read_from_this_one() {
+        let survey = two_monitors();
+        let shown = readouts(&survey, 0).expect("a display");
+        assert!(shown.others.contains("DP-2"), "{}", shown.others);
+        assert!(shown.others.contains("Display P3"), "{}", shown.others);
+        // Approximated, and saying so. An honest approximation the user can
+        // see is the whole trade made in `dr_plat::display`.
+        assert!(shown.others.contains("nearest to"), "{}", shown.others);
+        assert!(shown.others.contains("EIZO CG279X"), "{}", shown.others);
+
+        // And from the second monitor's point of view, the first is the other.
+        let shown = readouts(&survey, 1).expect("a display");
+        assert!(shown.colour.contains("Display P3"), "{}", shown.colour);
+        assert!(shown.others.contains("eDP-1"), "{}", shown.others);
+    }
+
+    /// A single-monitor desktop leaves the row empty rather than repeating
+    /// itself, which is what makes the row conditional in `settings.slint`.
+    #[test]
+    fn one_display_has_no_others_to_list() {
+        let survey = DisplaySurvey::assumed_srgb(FallbackReason::NoWaylandProtocol);
+        let shown = readouts(&survey, 0).expect("a display");
+        assert!(shown.others.is_empty(), "{}", shown.others);
+    }
 
     /// TRACES: FR-DSP-8
     /// Fractional scaling renders more pixels, not the same pixels stretched.