diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index 59c069f77e7..d410d3a20ef 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -711,6 +711,7 @@ ListOfTemplates=List of templates
 Genderman=Man
 Genderwoman=Woman
 ViewList=List view
+Mandatory=Mandatory
 # Week day
 Monday=Monday
 Tuesday=Tuesday