Index: trunk/psModules/src/imcombine/pmSubtractionEquation.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionEquation.c	(revision 24293)
+++ trunk/psModules/src/imcombine/pmSubtractionEquation.c	(revision 24297)
@@ -15,5 +15,5 @@
 #include "pmSubtractionVisual.h"
 
-//#define TESTING
+//#define TESTING                         // TESTING output for debugging; may not work with threads!
 
 #define USE_VARIANCE                    // Include variance in equation?