Index: branches/eam_branches/gDiff.20200202/src/gDiffDefineOutput.c
===================================================================
--- branches/eam_branches/gDiff.20200202/src/gDiffDefineOutput.c	(revision 41413)
+++ branches/eam_branches/gDiff.20200202/src/gDiffDefineOutput.c	(revision 41414)
@@ -27,4 +27,7 @@
 
     // The output readout may already be present if we read in the convolution kernel
+    // NOTE: pmReadoutAlloc returns a reference and saves one on the supplied cell.  The
+    // psMemIncrRefCounter below is needed in the first block so we can free the
+    // reference.  (we should code this to drop the returned reference in the second block
     pmReadout *outRO = NULL;            // Output readout
     if (outCell->readouts && outCell->readouts->n > 0 && outCell->readouts->data[0]) {