Additonal help file - addsubject.

lang/en/help/dialogue/addsubject.html

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+<p align="center"><b>Adding Subjects</b></p>
+
+<p>You can use this link to add a Subject to the dialogue. It's a 
+    good idea to always have a subject for the dialogue, it keeps 
+    the dialogue on track and focuses the replies on the topic. 
+    If you want to start talking about another subject it is 
+    better to close the current dialogue and start a new dialogue 
+    on that topic.</p>
+