Index: /trunk/ppSub/src/ppSubArguments.c
===================================================================
--- /trunk/ppSub/src/ppSubArguments.c	(revision 14628)
+++ /trunk/ppSub/src/ppSubArguments.c	(revision 14629)
@@ -18,5 +18,6 @@
     fprintf(stderr, "\nPan-STARRS PSF-matched image subtraction\n\n");
     fprintf(stderr, "Usage: %s INPUT.fits REFERENCE.fits OUTPUT_ROOT \n"
-            "\t[-psf REFERENCE.psf.fits|-psflist REFERENCE.list]\n",
+            "\t[-psf REFERENCE.psf.fits|-psflist REFERENCE.list]\n\n"
+            "This subtracts the convolved REFERENCE from the INPUT, by default.\n",
             program);
     fprintf(stderr, "\n");