www-cgi/: Document ?DEFAULTS environment filters

This feature was documented in the commit message, but not in the
tree.

Introduce a straight copy of the commit message from
 aa0bce91 "www-cgi: Introduce `?DEFAULTS' pattern to match the default set.""

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/www-cgi/README.custom-env-filter b/www-cgi/README.custom-env-filter
index 245d071bbcd9cdb3231e431c9deabe590b5640fa..5ebc1db1d379df09780f2de2c5ab989de7bc5392 100644 (file)
--- a/www-cgi/README.custom-env-filter
+++ b/www-cgi/README.custom-env-filter
@@ -21,3 +21,6 @@ command-line options to CGI scripts from webservers, but pretty easy to
 set environment variables; whereas it's hard to pass environment
 variables to a service program in a Userv configuration file, but easy
 to pass command-line arguments.
+
+
+www-cgi: Introduce `?DEFAULTS' pattern to match the default set.