diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49bc3a04b..de1b5abc7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,7 @@
 - [#4418](https://github.com/influxdata/telegraf/pull/4418): Add support for setting kafka client id.
 - [#4332](https://github.com/influxdata/telegraf/pull/4332): Add file input plugin and grok parser.
 - [#4320](https://github.com/influxdata/telegraf/pull/4320): Improve cloudwatch output performance.
+- [#3768](https://github.com/influxdata/telegraf/pull/3768): Add x509_cert input plugin.
 
 ## v1.7.2 [2018-07-18]
 
diff --git a/plugins/inputs/x509_cert/README.md b/plugins/inputs/x509_cert/README.md
index 6b922f0e1..781b9332a 100644
--- a/plugins/inputs/x509_cert/README.md
+++ b/plugins/inputs/x509_cert/README.md
@@ -13,7 +13,7 @@ file or network connection.
   sources = ["/etc/ssl/certs/ssl-cert-snakeoil.pem", "https://example.org"]
 
   ## Timeout for SSL connection
-  # timeout = 5s
+  # timeout = "5s"
 
   ## Optional TLS Config
   # tls_ca = "/etc/telegraf/ca.pem"
diff --git a/plugins/inputs/x509_cert/x509_cert.go b/plugins/inputs/x509_cert/x509_cert.go
index 2e5d26996..252b60e1f 100644
--- a/plugins/inputs/x509_cert/x509_cert.go
+++ b/plugins/inputs/x509_cert/x509_cert.go
@@ -23,7 +23,7 @@ const sampleConfig = `
   sources = ["/etc/ssl/certs/ssl-cert-snakeoil.pem", "tcp://example.org:443"]
 
   ## Timeout for SSL connection
-  # timeout = 5s
+  # timeout = "5s"
 
   ## Optional TLS Config
   # tls_ca = "/etc/telegraf/ca.pem"