Index: trunk/psModules/src/detrend/pmFlatField.c
===================================================================
--- trunk/psModules/src/detrend/pmFlatField.c	(revision 9612)
+++ trunk/psModules/src/detrend/pmFlatField.c	(revision 10330)
@@ -7,6 +7,7 @@
 
 #include "pmFPA.h"
+#include "pmHDUUtils.h"
+#include "pmFPAMaskWeight.h"
 #include "pmFlatField.h"
-#include "pmFPAMaskWeight.h"
 
 
@@ -33,4 +34,14 @@
     psImage *flatImage = flat->image;   // Flat-field image
     psImage *flatMask  = flat->mask;    // Mask for flat-field image
+
+    // Add flat-field MD5 to header
+    pmHDU *hdu = pmHDUFromReadout(in);  // HDU of interest
+    psVector *md5 = psImageMD5(flat->image); // md5 hash
+    psString md5string = psMD5toString(md5); // String
+    psFree(md5);
+    psStringPrepend(&md5string, "FLAT image MD5: ");
+    psMetadataAddStr(hdu->header, PS_LIST_TAIL, "HISTORY", PS_META_DUPLICATE_OK,
+                     md5string, "");
+    psFree(md5string);
 
     // Check input image is not larger than flat image; mask is the same size as the input
@@ -95,4 +106,13 @@
     }
 
+    psTime *time = psTimeGetNow(PS_TIME_TAI); // The time now, used for reporting
+    psString timeString = psTimeToISO(time); // String with time
+    psFree(time);
+    psStringPrepend(&timeString, "Flat-field processing completed at ");
+    psMetadataAddStr(hdu->header, PS_LIST_TAIL, "HISTORY", PS_META_DUPLICATE_OK,
+                     timeString, "");
+    psFree(timeString);
+
+
     return true;
 }