diff --git a/client.go b/client.go
index f1f7f45..504fd18 100644
--- a/client.go
+++ b/client.go
@@ -28,6 +28,7 @@ type Request struct {
 	URL *url.URL
 
 	// For client requests, Host specifies the host on which the URL is sought.
+	// Host must contain a port.
 	// This field is ignored by the server.
 	Host string
 
diff --git a/examples/client/client.go b/examples/client/client.go
index 9e7cc37..22c96de 100644
--- a/examples/client/client.go
+++ b/examples/client/client.go
@@ -47,7 +47,7 @@ func init() {
 	}
 }
 
-// sendRequest sends a request to the given url.
+// sendRequest sends a request to the given URL.
 func sendRequest(req *gmi.Request) error {
 	resp, err := client.Send(req)
 	if err != nil {
diff --git a/server.go b/server.go
index b6fc341..b3ec45c 100644
--- a/server.go
+++ b/server.go
@@ -212,7 +212,7 @@ func InputHandler(prompt string) Handler {
 	})
 }
 
-// Redirect replies to the request with a redirect to the given url.
+// Redirect replies to the request with a redirect to the given URL.
 func Redirect(rw *ResponseWriter, req *Request, url string) {
 	rw.WriteHeader(StatusRedirect, url)
 }