diff --git a/Modules/main.c b/Modules/main.c
index cc18dfae77d..b882ff9e00b 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -53,7 +53,7 @@ static int  orig_argc;
 
 /* Short usage message (with %s for argv0) */
 static char *usage_line =
-"usage: %s [-d] [-i] [-O] [-s] [-u] [-v] [-c cmd | file | -] [arg] ...\n";
+"usage: %s [-d] [-i] [-O] [-S] [-u] [-v] [-X] [-c cmd | file | -] [arg] ...\n";
 
 /* Long usage message, split into parts < 512 bytes */
 static char *usage_top = "\n\
@@ -62,15 +62,18 @@ Options and arguments (and corresponding environment variables):\n\
 -i     : inspect interactively after running script, (also PYTHONINSPECT=x)\n\
          and force prompts, even if stdin does not appear to be a terminal.\n\
 -O     : optimize generated bytecode (a tad).\n\
--u     : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
--X     : disable class based built-in exceptions\n\
--v     : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
+-S     : don't imply 'import site' on initialization\n\
 ";
-static char *usage_bot = "\
+static char *usage_mid = "\
+-u     : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
+-v     : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
+-X     : disable class based built-in exceptions\n\
 -c cmd : program passed in as string (terminates option list)\n\
 file   : program read from script file\n\
 -      : program read from stdin (default; interactive mode if a tty)\n\
 arg ...: arguments passed to program in sys.argv[1:]\n\
+";
+static char *usage_bot = "\
 \n\
 Other environment variables:\n\
 PYTHONSTARTUP: file executed on interactive startup (no default)\n\
@@ -107,7 +110,7 @@ Py_Main(argc, argv)
 		unbuffered = 1;
 
 	Py_UseClassExceptionsFlag = 1;
-	while ((c = getopt(argc, argv, "c:diOuvX")) != EOF) {
+	while ((c = getopt(argc, argv, "c:diOSuvX")) != EOF) {
 		if (c == 'c') {
 			/* -c is the last option; following arguments
 			   that look like options are left for the
@@ -136,6 +139,10 @@ Py_Main(argc, argv)
 			Py_OptimizeFlag++;
 			break;
 
+		case 'S':
+			Py_NoSiteFlag++;
+			break;
+
 		case 'u':
 			unbuffered++;
 			break;
@@ -153,6 +160,7 @@ Py_Main(argc, argv)
 		default:
 			fprintf(stderr, usage_line, argv[0]);
 			fprintf(stderr, usage_top);
+			fprintf(stderr, usage_mid);
 			fprintf(stderr, usage_bot);
 			exit(2);
 			/*NOTREACHED*/