Index: trunk/ippconfig/recipes/reductionClasses.mdc
===================================================================
--- trunk/ippconfig/recipes/reductionClasses.mdc	(revision 38863)
+++ trunk/ippconfig/recipes/reductionClasses.mdc	(revision 40034)
@@ -665,8 +665,8 @@
 END
 
-# reduction class specifically for warpwarp diffs:
+# reduction class specifically for stackstack diffs:
 STACKSTACK	METADATA
 	DIFF_PPSUB	STR	STACKSTACK
-	DIFF_PSPHOT	STR	DIFF
+	DIFF_PSPHOT	STR	STACK_DIFF
 	JPEG_BIN1	STR	PPIMAGE_J1
 	JPEG_BIN2	STR	PPIMAGE_J2