document leading + option
diff --git a/libbb/getopt_ulflags.c b/libbb/getopt_ulflags.c
index bfd7aae..199147b 100644
--- a/libbb/getopt_ulflags.c
+++ b/libbb/getopt_ulflags.c
@@ -69,6 +69,13 @@
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