Updated usage description to highlight the presence of multiple executables.

README

@@ -11,7 +11,10 @@
 
 See INSTALL.swift for install instructions.
 
-Usage: swift [OPTION] PARAMFILE
+Usage: swift [OPTION]... PARAMFILE
+       swift_mpi [OPTION]... PARAMFILE
+       swift_fixdt [OPTION]... PARAMFILE
+       swift_fixdt_mpi [OPTION]... PARAMFILE
 
 Valid options are:
   -a          Pin runners using processor affinity

examples/main.c

@@ -50,7 +50,11 @@
  */
 void print_help_message() {
 
-  printf("\nUsage: swift [OPTION] PARAMFILE\n\n");
+  printf("\nUsage: swift [OPTIONS] PARAMFILE\n");
+  printf("       swift_mpi [OPTIONS] PARAMFILE\n");
+  printf("       swift_fixdt [OPTIONS] PARAMFILE\n");
+  printf("       swift_fixdt_mpi [OPTIONS] PARAMFILE\n\n");
+
   printf("Valid options are:\n");
   printf("  %2s %8s %s\n", "-a", "", "Pin runners using processor affinity");
   printf("  %2s %8s %s\n", "-c", "", "Run with cosmological time integration");