diff --git a/plugins/inputs/docker/README.md b/plugins/inputs/docker/README.md
index fa662ca80..6086c89e8 100644
--- a/plugins/inputs/docker/README.md
+++ b/plugins/inputs/docker/README.md
@@ -74,6 +74,7 @@ on the availability of per-cpu stats on your system.
     - usage_in_usermode
     - usage_system
     - usage_total
+    - usage_percent
 - docker_net
     - rx_dropped
     - rx_bytes