diff --git a/plugins/inputs/upsd/README.md b/plugins/inputs/upsd/README.md
index daf9112d68e5b..e1b832fed8629 100644
--- a/plugins/inputs/upsd/README.md
+++ b/plugins/inputs/upsd/README.md
@@ -22,6 +22,7 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
 # Monitor UPSes connected via Network UPS Tools
 [[inputs.upsd]]
   ## A running NUT server to connect to.
+  ## IPv6 addresses must be enclosed in brackets (e.g. "[::1]")
   # server = "127.0.0.1"
   # port = 3493
   # username = "user"
diff --git a/plugins/inputs/upsd/sample.conf b/plugins/inputs/upsd/sample.conf
index 03387e5047b93..362e0e3bf92ef 100644
--- a/plugins/inputs/upsd/sample.conf
+++ b/plugins/inputs/upsd/sample.conf
@@ -1,6 +1,7 @@
 # Monitor UPSes connected via Network UPS Tools
 [[inputs.upsd]]
   ## A running NUT server to connect to.
+  ## IPv6 addresses must be enclosed in brackets (e.g. "[::1]")
   # server = "127.0.0.1"
   # port = 3493
   # username = "user"