document leading + option

diff --git a/libbb/getopt_ulflags.c b/libbb/getopt_ulflags.c
index bfd7aae7fcfdf7078ab781ba8a5127fdf880bf14..199147b76602eaf22a6db34f8367c910d6e882ca 100644 (file)
--- a/libbb/getopt_ulflags.c
+++ b/libbb/getopt_ulflags.c
@@ -69,6 +69,13 @@ bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
        by the "::" special separator that is set in the external string
        bb_opt_complementally (see below for more info).
 
+ "+"    If the first character in the applet_opts string is a plus,
+       then option processing will stop as soon as a non-option is
+       encountered in the argv array.  Useful for applets like env
+       which should not process arguments to subprograms:
+       env -i ls -d /
+       Here we want env to process just the '-i', not the '-d'.
+
 static const struct option bb_default_long_options[]
 
        This struct allows you to define long options.  The syntax for