Index: trunk/psastro/src/psastroExtractArguments.c
===================================================================
--- trunk/psastro/src/psastroExtractArguments.c	(revision 23412)
+++ trunk/psastro/src/psastroExtractArguments.c	(revision 23591)
@@ -13,5 +13,5 @@
 # include "psastroStandAlone.h"
 
-static char *usage = "USAGE: psastroExtract [-outroot root] -astrom (cmffiles)";
+static char *usage = "USAGE: psastroExtract -file (input) -astrom (cmffiles) -outroot (outroot) [-chip]";
 
 pmConfig *psastroExtractArguments (int argc, char **argv) {