diff --git a/README.md b/README.md
index e8f3d613e..8d08c6dfd 100644
--- a/README.md
+++ b/README.md
@@ -282,6 +282,7 @@ For documentation on the latest development code see the [documentation index][d
 * [win_perf_counters](./plugins/inputs/win_perf_counters) (windows performance counters)
 * [win_services](./plugins/inputs/win_services)
 * [wireless](./plugins/inputs/wireless)
+* [x509_cert](./plugins/inputs/x509_cert)
 * [zfs](./plugins/inputs/zfs)
 * [zipkin](./plugins/inputs/zipkin)
 * [zookeeper](./plugins/inputs/zookeeper)