diff --git a/helper/communicator/config.go b/helper/communicator/config.go
index 55f408076..01f93b023 100644
--- a/helper/communicator/config.go
+++ b/helper/communicator/config.go
@@ -179,7 +179,7 @@ type WinRM struct {
 	// [`ssh_interface`](/docs/builders/amazon-ebs#ssh_interface)
 	WinRMHost string `mapstructure:"winrm_host"`
 	// Setting this to `true` adds the remote
-	// `host:post` to the `NO_PROXY` environment variable. This has the effect of
+	// `host:port` to the `NO_PROXY` environment variable. This has the effect of
 	// bypassing any configured proxies when connecting to the remote host.
 	// Default to `false`.
 	WinRMNoProxy bool `mapstructure:"winrm_no_proxy"`
diff --git a/helper/communicator/step_connect_winrm.go b/helper/communicator/step_connect_winrm.go
index 6c37719ef..2600440ee 100644
--- a/helper/communicator/step_connect_winrm.go
+++ b/helper/communicator/step_connect_winrm.go
@@ -205,11 +205,6 @@ func (s *StepConnectWinRM) waitForWinRM(state multistep.StateBag, ctx context.Co
 func setNoProxy(host string, port int) error {
 	current := os.Getenv("NO_PROXY")
 	p := fmt.Sprintf("%s:%d", host, port)
-	// not set
-	//	set
-	// is set and not contains
-	//	set
-	// is set and contains
 	if current == "" {
 		return os.Setenv("NO_PROXY", p)
 	}
@@ -233,7 +228,12 @@ func envProxyFunc() func(*url.URL) (*url.URL, error) {
 	return envProxyFuncValue
 }
 
-// c.WinRMTransportDecorator = func() winrm.Transporter { return &winrm.ClientNTLM{} }
+// ProxyTransportDecorator is a custom Transporter that reloads HTTP Proxy settings at client runtime.
+// The net/http ProxyFromEnvironment only loads the environment once, when the
+// code is initialized rather than when it's executed. This means that if your
+// wrapping code sets the NO_PROXY env var (as Packer does!), it will be
+// ignored. Re-loading the environment vars is more expensive, but it is the
+// easiest way to work around this limitation.
 func ProxyTransportDecorator() winrmcmd.Transporter {
 	return winrmcmd.NewClientWithProxyFunc(RefreshProxyFromEnvironment)
 }
diff --git a/website/pages/partials/helper/communicator/WinRM-not-required.mdx b/website/pages/partials/helper/communicator/WinRM-not-required.mdx
index 99ea7c9b3..7aee05b63 100644
--- a/website/pages/partials/helper/communicator/WinRM-not-required.mdx
+++ b/website/pages/partials/helper/communicator/WinRM-not-required.mdx
@@ -11,7 +11,7 @@
     [`ssh_interface`](/docs/builders/amazon-ebs#ssh_interface)
     
 -   `winrm_no_proxy` (bool) - Setting this to `true` adds the remote
-    `host:post` to the `NO_PROXY` environment variable. This has the effect of
+    `host:port` to the `NO_PROXY` environment variable. This has the effect of
     bypassing any configured proxies when connecting to the remote host.
     Default to `false`.