diff --git a/src/ui.cpp b/src/ui.cpp
index 4d48820..52cc718 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -8604,8 +8604,9 @@ gboolean condition_probe_arm(gpointer user) {
   gtk_drop_down_set_selected(GTK_DROP_DOWN(a->trigger_edge_drop), edge_idx);
   gtk_spin_button_set_value(GTK_SPIN_BUTTON(a->trigger_width_spin), 0.010);
   gtk_spin_button_set_value(GTK_SPIN_BUTTON(a->trigger_timeout_spin), g_condition.timeout);
-  // The band for the window leg: straddling zero, well inside the square's +/-1, so each
-  // transition both enters and leaves it. Harmless for the other legs, which ignore `level2`.
+  // The band for the window leg: straddling zero and well inside the sine's +/-1, so the sine
+  // crosses into it and out of it twice a period. Harmless for the other legs, which ignore
+  // `level2`.
   gtk_spin_button_set_value(GTK_SPIN_BUTTON(a->trigger_level2_spin), 0.5);
   // Zero for every leg but the window, whose band is `[-0.5, +0.5]`.
   gtk_spin_button_set_value(GTK_SPIN_BUTTON(a->trigger_level_spin),