diff --git a/README.md b/README.md
index 7b39e8b..d99844c 100644
--- a/README.md
+++ b/README.md
@@ -21,3 +21,17 @@ nagios ALL=(ALL) NOPASSWD: /usr/bin/birdc
 ```
 command[check_bird2_oneshot]=/usr/local/lib64/nagios/plugins/check_bird2_oneshot -s
 ```
+
+If you need to ignore some protocols, put them in
+`/usr/local/etc/nrpe-bird/ignore.cfg`, one per line, e.g.:
+```
+bfd1
+bgp_nlnogringlg01_ipv4
+bgp_nlnogringlg01_ipv6
+device1
+direct1
+kernel_ipv4
+kernel_ipv6
+static_alarig_allocations_ipv4
+static_alarig_allocations_ipv6
+```