diff --git a/api/net/sf/briar/api/db/MessageHeader.java b/api/net/sf/briar/api/db/MessageHeader.java
index bbbcd85cf08d6009d75c234f4cdb0a2a638523a2..dc5b4e529600be60f6f140d492058cc9de93f366 100644
--- a/api/net/sf/briar/api/db/MessageHeader.java
+++ b/api/net/sf/briar/api/db/MessageHeader.java
@@ -10,8 +10,8 @@ public interface MessageHeader {
 	MessageId getId();
 
 	/**
-	 * Returns the message's parent, or MessageId.NONE if this is the first
-	 * message in a thread.
+	 * Returns the message's parent, or null if this is the first message in a
+	 * thread.
 	 */
 	MessageId getParent();
 
diff --git a/api/net/sf/briar/api/protocol/Message.java b/api/net/sf/briar/api/protocol/Message.java
index e4b702fc7385d84c40fd2702f2aa60bbaf274c9e..e292bcab78c7b856375c6c5051419485b1206189 100644
--- a/api/net/sf/briar/api/protocol/Message.java
+++ b/api/net/sf/briar/api/protocol/Message.java
@@ -6,8 +6,8 @@ public interface Message {
 	MessageId getId();
 
 	/**
-	 * Returns the message's parent, or MessageId.NONE if this is the first
-	 * message in a thread.
+	 * Returns the message's parent, or null if this is the first message in a
+	 * thread.
 	 */
 	MessageId getParent();