diff --git a/videosink/display.go b/videosink/display.go
index 05d67d8..24df42f 100644
--- a/videosink/display.go
+++ b/videosink/display.go
@@ -38,6 +38,8 @@ type Options struct {
 	// TODO: Add options for JPEG and PNG encoder settings
 }
 
+// Display is a virtual device receiving drawing operations and sending
+// a stream of images to all connected HTTP clients.
 type Display struct {
 	defaultFormat ImageFormat