diff --git a/tools/mksymtab.c b/tools/mksymtab.c
index a0e1c0d95b..c2e5abcd87 100644
--- a/tools/mksymtab.c
+++ b/tools/mksymtab.c
@@ -71,13 +71,16 @@ static int nhdrfiles;
 
 static void show_usage(const char *progname)
 {
-  fprintf(stderr, "USAGE: %s <cvs-file> <symtab-file> [<symtab-name> [<nsymbols-name>]]\n\n", progname);
+  fprintf(stderr, "USAGE: %s <cvs-file> [-d] <symtab-file> [<symtab-name> [<nsymbols-name>]]\n\n",
+          progname);
   fprintf(stderr, "Where:\n\n");
-  fprintf(stderr, "  <cvs-file>     : The path to the input CSV file (required)\n");
-  fprintf(stderr, "  <symtab-file>  : The path to the output symbol table file (required)\n");
-  fprintf(stderr, "  <symtab-name>  : Optional name for the symbol table variable\n");
-  fprintf(stderr, "  <nsymbols-name>: Optional name for the symbol count variable\n");
-  fprintf(stderr, "  -d             : Enable debug output\n");
+  fprintf(stderr, "  <cvs-file>      : The path to the input CSV file (required)\n");
+  fprintf(stderr, "  <symtab-file>   : The path to the output symbol table file (required)\n");
+  fprintf(stderr, "  <symtab-name>   : Optional name for the symbol table variable\n");
+  fprintf(stderr, "                    Default: \"%s\"\n", SYMTAB_NAME);
+  fprintf(stderr, "  <nsymbols-name> : Optional name for the symbol table variable\n");
+  fprintf(stderr, "                    Default: \"%s\"\n", NSYMBOLS_NAME);
+  fprintf(stderr, "  -d              : Enable debug output\n");
   exit(EXIT_FAILURE);
 }