Index: trunk/ppStack/src/ppStackLoop.h
===================================================================
--- trunk/ppStack/src/ppStackLoop.h	(revision 23368)
+++ trunk/ppStack/src/ppStackLoop.h	(revision 23576)
@@ -30,4 +30,11 @@
 // Convolve inputs to match target PSF
 bool ppStackConvolve(
+    ppStackOptions *options,            // Options
+    pmConfig *config                    // Configuration
+    );
+
+// Prepare for combination
+bool ppStackCombinePrepare(
+    ppStackThreadData *stack,           // Stack
     ppStackOptions *options,            // Options
     pmConfig *config                    // Configuration