diff --git a/internal/opcua/util.go b/internal/opcua/util.go
index 579ed088c8d79..e58f0796fedee 100644
--- a/internal/opcua/util.go
+++ b/internal/opcua/util.go
@@ -144,7 +144,6 @@ func pemBlockForKey(priv interface{}) (*pem.Block, error) {
 	}
 }
 
-//revive:disable-next-line
 func (o *OpcUAClient) generateClientOpts(endpoints []*ua.EndpointDescription) ([]opcua.Option, error) {
 	opts := []opcua.Option{}
 	appuri := "urn:telegraf:gopcua:Client"
diff --git a/plugins/inputs/opcua/README.md b/plugins/inputs/opcua/README.md
index 67cdd6e15270e..8805a6e4bd1c7 100644
--- a/plugins/inputs/opcua/README.md
+++ b/plugins/inputs/opcua/README.md
@@ -16,9 +16,9 @@ Plugin minimum tested version: 1.16
   ## OPC UA Endpoint URL
   # endpoint = "opc.tcp://localhost:4840"
   #
-  ## The service set to use to retrieve/receive the values from the OPC UA server
+  ## The service set to use to retrieve/receive the values from the
+  ## OPC UA server. One of "request" or "subscribe"
   # connection_service = "request"
-  # connection_service = "subscribe"
   #
   ## Maximum time allowed to establish a connect to the endpoint.
   # connect_timeout = "10s"
@@ -27,11 +27,9 @@ Plugin minimum tested version: 1.16
   # request_timeout = "5s"
   #
   ## The interval at which the server should at least update its monitored items
-  ## https://reference.opcfoundation.org/v104/Core/docs/Part4/5.13.1/
   ## Only used when connection_service = "subscribe"
   # subscription_interval = "100ms"
   #
-  #
   ## Security policy, one of "None", "Basic128Rsa15", "Basic256",
   ## "Basic256Sha256", or "auto"
   # security_policy = "auto"
@@ -124,7 +122,6 @@ This node configuration produces a metric like this:
 
 ```text
 opcua,id=n\=3;s\=Temperature temp=79.0,quality="OK (0x0)" 1597820490000000000
-
 ```
 
 ## Group Configuration
@@ -162,6 +159,19 @@ This example group configuration has two groups with two nodes each:
   ]
 ```
 
+## Connection Service
+
+This plugin supports the Request and the Subscription service
+to retrieve data from the OPC server. The difference between
+these two services are described in the [OPC Foundation 
+Part 4 Chapter 5](
+https://reference.opcfoundation.org/v104/Core/docs/Part4/#5)
+
+The subscription service allows clients to set the set uses
+maximum interval at which they want to receive updates.
+This interval can be set through the `subscription_interval`
+setting.
+
 ## Metrics
 
 The metrics collected by this input plugin will depend on the
@@ -169,7 +179,7 @@ configured `nodes` and `group`.
 
 ## Example Output
 
-```shell
+```text
 group1_metric_name,group1_tag=val1,id=ns\=3;i\=1001,node1_tag=val2 name=0,Quality="OK (0x0)" 1606893246000000000
 group1_metric_name,group1_tag=val1,id=ns\=3;i\=1002,node1_tag=val3 name=-1.389117,Quality="OK (0x0)" 1606893246000000000
 group2_metric_name,group2_tag=val3,id=ns\=3;i\=1003,node2_tag=val4 Quality="OK (0x0)",saw=-1.6 1606893246000000000
diff --git a/plugins/inputs/opcua/read_client_test.go b/plugins/inputs/opcua/read_client_test.go
deleted file mode 100644
index b0c6fcd0f15d9..0000000000000
--- a/plugins/inputs/opcua/read_client_test.go
+++ /dev/null
@@ -1 +0,0 @@
-package opcua
diff --git a/plugins/inputs/opcua/sample.conf b/plugins/inputs/opcua/sample.conf
index e57b0e6be0fbc..8ea8eb290946f 100644
--- a/plugins/inputs/opcua/sample.conf
+++ b/plugins/inputs/opcua/sample.conf
@@ -6,9 +6,9 @@
   ## OPC UA Endpoint URL
   # endpoint = "opc.tcp://localhost:4840"
   #
-  ## The service set to use to retrieve/receive the values from the OPC UA server
+  ## The service set to use to retrieve/receive the values from the
+  ## OPC UA server. One of "request" or "subscribe"
   # connection_service = "request"
-  # connection_service = "subscribe"
   #
   ## Maximum time allowed to establish a connect to the endpoint.
   # connect_timeout = "10s"
@@ -17,11 +17,9 @@
   # request_timeout = "5s"
   #
   ## The interval at which the server should at least update its monitored items
-  ## https://reference.opcfoundation.org/v104/Core/docs/Part4/5.13.1/
   ## Only used when connection_service = "subscribe"
   # subscription_interval = "100ms"
   #
-  #
   ## Security policy, one of "None", "Basic128Rsa15", "Basic256",
   ## "Basic256Sha256", or "auto"
   # security_policy = "auto"