Index: trunk/pstamp/src/ppstampMakeStamp.c
===================================================================
--- trunk/pstamp/src/ppstampMakeStamp.c	(revision 35611)
+++ trunk/pstamp/src/ppstampMakeStamp.c	(revision 35893)
@@ -165,4 +165,13 @@
 
     ppstampVersionMetadata(outHDU->header, options);
+
+    // copy any user supplied keywords
+    if (options->headerAdditions) {
+        if (!psMetadataOverlay(outHDU->header, options->headerAdditions)) {
+            psError(PS_ERR_UNKNOWN, false, "Failed to copy header additions to output\n");
+            return false;
+        }
+    }
+
 
     return true;