Index: /trunk/psphot/src/psphotSignificanceImage.c
===================================================================
--- /trunk/psphot/src/psphotSignificanceImage.c	(revision 18836)
+++ /trunk/psphot/src/psphotSignificanceImage.c	(revision 18837)
@@ -12,4 +12,6 @@
     // smooth the image and weight map
     psTimerStart ("smooth");
+
+    // XXX we can a) choose fft to convolve if needed and b) multithread fftw
 
     bool status_x, status_y;
@@ -94,4 +96,5 @@
     psMetadataAddF32  (recipe, PS_LIST_TAIL, "SIGNIFICANCE_SCALE_FACTOR", PS_META_REPLACE, "Signicance scale factor", factor);
 
+    // XXX multithread this if needed
     for (int j = 0; j < smooth_im->numRows; j++) {
         for (int i = 0; i < smooth_im->numCols; i++) {