diff -r 6dfbe504f659 Modules/main.c
--- a/Modules/main.c	Sat Jun 07 13:50:34 2014 -0700
+++ b/Modules/main.c	Sat Jun 07 14:57:45 2014 -0700
@@ -59,6 +59,8 @@
 /* Long usage message, split into parts < 512 bytes */
 static char *usage_1 = "\
 Options and arguments (and corresponding environment variables):\n\
+-b     : issue warnings about str(bytes_instance), str(bytearray_instance)\n\
+         and comparing bytes/bytearray with str. (-bb: issue errors)\n\
 -B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x\n\
 -c cmd : program passed in as string (terminates option list)\n\
 -d     : debug output from parser; also PYTHONDEBUG=x\n\