diff --git a/EmotionmlDocument.cs b/EmotionmlDocument.cs
index dca8073..ef1aff2 100644
--- a/EmotionmlDocument.cs
+++ b/EmotionmlDocument.cs
@@ -354,7 +354,7 @@ public XmlDocument ToDom()
 
             if (plaintext != null)
             {
-                emotionmlXml.AppendChild(emotionmlXml.CreateTextNode(plaintext));
+                emotionmlXml.DocumentElement.AppendChild(emotionmlXml.CreateTextNode(plaintext));
             }
 
             //TODO: validate against scheme (as static method)