diff --git a/intervention.md b/intervention.md
index 303068d..5103fc1 100644
--- a/intervention.md
+++ b/intervention.md
@@ -86,6 +86,8 @@ So, for example, we will launch `rsync R:\postgresql\local\archivelog 10.6.x.3\R
 To copy archivelogs from one server to the opposite.  
 
 
+### Mandatory
+