Otherwise this pointer is NULL. The 'user_mode' is the client's mode in
the SILC network. The 'notification' contains the notify type that
happened for the 'watched_client' (for example
-SILC_NOTIFY_TYPE_NICK_CHANGE if the client changed their nickname).
+SILC_NOTIFY_TYPE_NICK_CHANGE if the client changed their nickname). If
+the `new_nickname' is NULL and `notification' is SILC_NOTIFY_TYPE_NONE the
+`watched_client' has just joined the network.
</td>
<td width="50%"><small>SilcClientEntry watched_client, char *new_nickname,
SilcUInt32 user_mode, SilcNotifyType notification, SilcPublicKey