diff --git a/conf/flight_plans/flight_plan.dtd b/conf/flight_plans/flight_plan.dtd
index 80bd8c2eda..b114f4e487 100644
--- a/conf/flight_plans/flight_plan.dtd
+++ b/conf/flight_plans/flight_plan.dtd
@@ -1,9 +1,11 @@
 <!-- Paparazzi flight plan DTD -->
 
-<!ELEMENT flight_plan (waypoints,include*,exceptions?,blocks)>
+<!ELEMENT flight_plan (header?, waypoints,include*,exceptions?,blocks)>
 
 <!ELEMENT procedure (param*,waypoints,exceptions?,blocks)>
 
+<!ELEMENT header (#PCDATA)>
+
 <!ELEMENT waypoints (waypoint+)>
 <!ELEMENT waypoint EMPTY>
 
@@ -111,8 +113,7 @@ climb CDATA #IMPLIED>
 
 <!ATTLIST set
 var CDATA #REQUIRED
-value CDATA #REQUIRED
-until CDATA #IMPLIED>
+value CDATA #REQUIRED>
 
 <!ATTLIST follow
 ac_id CDATA #REQUIRED
@@ -175,3 +176,5 @@ to CDATA #REQUIRED>
 <!ATTLIST param
 name CDATA #REQUIRED
 default_value CDATA #IMPLIED>
+
+<!ATTLIST header>