[Doc] Add documentation for the new ratelimit option

diff --git a/doc/markdown/modules/ratelimit.md b/doc/markdown/modules/ratelimit.md
index 9c20c16d73868b3891a7fc38275b83ca351ceeda..c3601746175b0cfa233fd866fa00540be611d921 100644 (file)
--- a/doc/markdown/modules/ratelimit.md
+++ b/doc/markdown/modules/ratelimit.md
@@ -19,6 +19,7 @@ the value of this option is 'postmaster, mailer-daemon'
 - `whitelisted_ip` - a map of ip addresses or networks whitelisted
 - `max_rcpts` - do not apply ratelimit if it contains more than this value of recipients (5 by default). This
 option allows to avoid too many work for setting buckets if there are a lot of recipients in a message).
+- `max_delay` - maximum lifetime for any limit bucket (1 day by default)
 - `rates` - a table of allowed rates in form:
 
     type = [burst,leak];