Index: trunk/ppImage/src/ppImageConfig.c
===================================================================
--- trunk/ppImage/src/ppImageConfig.c	(revision 6260)
+++ trunk/ppImage/src/ppImageConfig.c	(revision 6318)
@@ -18,4 +18,5 @@
     config->arguments = psMetadataAlloc(); // The arguments, with default values
 
+    psMetadataAddStr(config->arguments, PS_LIST_TAIL, "-key", 0, "exposure ID", "");
     psMetadataAddStr(config->arguments, PS_LIST_TAIL, "-bias", 0, "Name of the bias image", "");
     psMetadataAddStr(config->arguments, PS_LIST_TAIL, "-dark", 0, "Name of the dark image", "");