Index: trunk/psphot/src/psphotAddNoise.c
===================================================================
--- trunk/psphot/src/psphotAddNoise.c	(revision 34418)
+++ trunk/psphot/src/psphotAddNoise.c	(revision 34492)
@@ -34,4 +34,5 @@
 static int Nmasked = 0;
 
+// the return state indicates if any sources were actually replaced
 bool psphotAddOrSubNoiseReadout (pmConfig *config, const pmFPAview *view, const char *filerule, int index, psMetadata *recipe, bool add) {
 
@@ -51,7 +52,6 @@
 
     psArray *sources = detections->allSources;
-    //psAssert (sources, "missing sources?");
-    // if no work, should just return true
-    if (!sources) return true;
+    // if no work to do, should just return true
+    if (!sources) return false;
 
     psTimerStart ("psphot.noise");
@@ -74,5 +74,5 @@
 
     if (SIZE <= 0) {
-       return true;
+       return false;
     }