diff --git a/src/web/public/terminal-ui.js b/src/web/public/terminal-ui.js
index 9b5dd1ca..3dac785a 100644
--- a/src/web/public/terminal-ui.js
+++ b/src/web/public/terminal-ui.js
@@ -6076,8 +6076,9 @@ Object.assign(CodemanApp.prototype, {
    * never sent a key at all. That page is pre-paid: the travel it skipped is
    * owed back by the rest of the gesture, so the rate stays one page per
    * `perPage` rows. A new touch contact (`ev.touchId`), a pause outside a contact
-   * (PAGE_KEY_GESTURE_GAP_MS, or PAGE_KEY_DEBT_MS while a same-direction page is
-   * still owed), a reversal after the gap or a tab switch starts a new gesture;
+   * (PAGE_KEY_GESTURE_GAP_MS; while a same-direction page is still owed,
+   * PAGE_KEY_DEBT_MS, or PAGE_KEY_NOTCH_DEBT_MS when a notch-sized opener pre-paid
+   * it), a reversal after the gap or a tab switch starts a new gesture;
    * one contact is never split by time, and a quick reversal never pre-pays. A
    * mouse-wheel notch pages at once too, and its debt (PAGE_KEY_NOTCH_DEBT_MS) is repaid by the
    * notches after it, so a mouse pages once per `perPage` rows of travel with the
diff --git a/test/terminal-scroll-routing.test.ts b/test/terminal-scroll-routing.test.ts
index 8be908e7..9f30dbe5 100644
--- a/test/terminal-scroll-routing.test.ts
+++ b/test/terminal-scroll-routing.test.ts
@@ -695,8 +695,9 @@ describe('pageKeysForGesture, the pure gesture rules both panes share', () => {
   });
 
   it('pages a notch-sized opening event at once, and the notches after it repay it', () => {
-    // Five 4-row notches 400 ms apart: the first pays the page, the next four (16 of the 15 rows
-    // owed on 38 rows) repay it, and none of them pages again.
+    // Five 4-row notches 400 ms apart: the first pays the page, the next four (16 rows of travel
+    // against the 14 owed on 36 rows, half a screen less the opener's 4) repay it, and none of them
+    // pages again.
     const steps = run([
       [-4, 0],
       [-4, 400],