diff --git a/image_analysis/spot_finding/SpotFindingSettings.h b/image_analysis/spot_finding/SpotFindingSettings.h
index cf626254..126d6442 100644
--- a/image_analysis/spot_finding/SpotFindingSettings.h
+++ b/image_analysis/spot_finding/SpotFindingSettings.h
@@ -17,7 +17,9 @@ struct SpotFindingSettings {
     float cutoff_spot_count_low_res = 5.0;
     std::optional<float> high_res_gap_Q_recipA = 1.5; // 0.25 * 2 * pi
 
-    float ice_ring_width_Q_recipA = 0.02;
+    // Half-width of the ice-ring exclusion band in q (2*pi/d). Measured hexagonal-ice ring FWHM on the
+    // JUNGFRAU is ~0.06 q, so the band half-width is ~0.03; 0.02 under-covered the strong low-res rings.
+    float ice_ring_width_Q_recipA = 0.03;
 
     bool indexing = true;
     bool quick_integration = true;