diff --git a/xml/dtd/pentestreport.xsd b/xml/dtd/pentestreport.xsd
index 95d970c..e89c3fe 100644
--- a/xml/dtd/pentestreport.xsd
+++ b/xml/dtd/pentestreport.xsd
@@ -48,6 +48,7 @@
     <xs:complexType>
       <xs:sequence>
         <xs:element ref="duration"/>
+        <xs:element ref="mandays"/>
         <xs:element ref="test_planning"/>
         <xs:element ref="report_due"/>
         <xs:element ref="nature"/>