diff --git a/dap/algos/streakfind.py b/dap/algos/streakfind.py
index 0e95b59..fd1c373 100644
--- a/dap/algos/streakfind.py
+++ b/dap/algos/streakfind.py
@@ -26,7 +26,7 @@ def calc_streakfinder_analysis(results, data, pixel_mask):
         return data
 
     negative_val_handler = results.get("cbd_negative_handler", "")
-    _handle_negative_values(data, pixel_mask, negative_val_handler)
+    _handle_negative_values(data, pixel_mask, negative_val_handler)  # changes data and pixel_mask in place
 
     try:
         snr = _calc_snr(results, data, pixel_mask)
@@ -35,11 +35,11 @@ def calc_streakfinder_analysis(results, data, pixel_mask):
         return data
 
     if do_snr:
-        # Changes data in-place
+        # Changes data in-place #TODO: actually, looks like this is not an in-place change
         data = snr
 
     try:
-        _calc_streakfinder_analysis(results, snr, pixel_mask)
+        _calc_streakfinder_analysis(results, snr, pixel_mask)  # changes pixel_mask in place if cbd_mask_rois given
     except Exception as error:  # Broad exception - we don't want to break anything here
         results["cbd_error"] = f"StreakFind - Error processing CBD data:\n{error}"
 
@@ -154,6 +154,7 @@ def _calc_streakfinder_analysis(results, snr, mask):
     y_center = results.get("beam_center_y", None)
 
     mask_rois = results.get("cbd_mask_rois", [])  # list of [x_min, x_max, y_min, y_max]
+    #TODO: copy mask if mask_rois is truthy
     for mask_roi in mask_rois:
         mask[mask_roi[2]: mask_roi[3], mask_roi[0]: mask_roi[1]] = False