diff --git a/shell/plugins/model-usage/Panel.qml b/shell/plugins/model-usage/Panel.qml
index c9646730..cc80917d 100644
--- a/shell/plugins/model-usage/Panel.qml
+++ b/shell/plugins/model-usage/Panel.qml
@@ -651,6 +651,8 @@ Panel {
                 required property var modelData
                 width: modelSection.width
                 row: modelData
+                // Scaled to the heaviest model, so the top row is always full —
+                // the same scale-to-peak the weekly chart uses for its busiest day.
                 share: modelData.total / Math.max(1, root.models[0].total)
               }
             }
diff --git a/shell/plugins/model-usage/README.md b/shell/plugins/model-usage/README.md
index 3d587682..59b224cf 100644
--- a/shell/plugins/model-usage/README.md
+++ b/shell/plugins/model-usage/README.md
@@ -19,8 +19,9 @@ adapter per subscription.
 - **Usage this week** — one row per day for the last week: day, bar, tokens, with today
   bolded at the bottom. Hover today for its prompt and session count.
 - **Usage by model** — total tokens and active days in the header, then
-  tokens per model with the bar behind each row showing its share of the
-  heaviest one. Hover for the input / output / cache split.
+  tokens per model with the bar behind each row scaled to the heaviest model,
+  the same way the weekly chart scales to its busiest day. Hover for the
+  input / output / cache split.
 
 A subscription appears only when it is enabled in settings and has actually
 recorded usage — on this machine or on a synced one. With one such provider