diff --git a/resources/schema/inventory.xsd b/resources/schema/inventory.xsd
index 58e624f..093ab8e 100644
--- a/resources/schema/inventory.xsd
+++ b/resources/schema/inventory.xsd
@@ -306,6 +306,8 @@
             </xsd:restriction>
           </xsd:simpleType>
         </xsd:attribute>
+        <xsd:attribute name="lemma" type="xsd:string"/>
+        <xsd:attribute name="msd" type="xsd:string"/> <!-- msd within the Slovene JOS system -->
         <xsd:attribute name="sloleks" type="xsd:string"/> <!-- Sloleks ID -->
         <xsd:attribute name="kol" type="xsd:string"/> <!-- legacy attribute for the word's lemma -->
         <xsd:attribute name="lexical_unit_lexeme_id" type="xsd:int"/> <!-- ID within its lexical unit -->