diff --git a/style.go b/style.go
index 2a48770f..d76db12d 100644
--- a/style.go
+++ b/style.go
@@ -161,7 +161,9 @@ type Style struct {
 
 	transform func(string) string
 
-	hyperlinkURL    string
+	hyperlinkURL string
+
+	// Hyperlink parameters are serialized into a string to ensure they copy.
 	hyperlinkParams string
 }