Index: tests/copyfile.cfa
===================================================================
--- tests/copyfile.cfa	(revision 2ed337102bdfac403bce073d85118376d19465ea)
+++ tests/copyfile.cfa	(revision d9326ad835b4ea7e2cfe6118290facb350e0e5ee)
@@ -10,6 +10,6 @@
 // Created On       : Fri Jun 19 13:44:05 2020
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Fri Jun 19 17:58:03 2020
-// Update Count     : 4
+// Last Modified On : Sun Jul  5 11:27:43 2020
+// Update Count     : 5
 // 
 
@@ -22,10 +22,10 @@
 
 	try {
-		choose ( argc ) {
+		choose ( argc ) {								// terminate if command-line errors
 		  case 2, 3:
 			open( in, argv[1] );						// open input file first as output creates file
 			if ( argc == 3 ) open( out, argv[2] );		// do not create output unless input opens
 		  case 1: ;										// use default files
-		  default:
+		  default:										// wrong number of options
 			exit | "Usage" | argv[0] | "[ input-file (default stdin) [ output-file (default stdout) ] ]";
 		} // choose