diff --git a/transkription.odd b/transkription.odd
index 0243204cf5a979b46271ff3e1084937522a02813..d84add299cf4808efec39f45b241db2018f60755 100644
--- a/transkription.odd
+++ b/transkription.odd
@@ -227,6 +227,19 @@
                     </attList>
                 </elementSpec>
                 
+                <elementSpec ident="change">
+                    <content>
+                        <empty/>
+                    </content>
+                    <attList>
+                        <attDef ident="when" usage="req">
+                            <datatype>
+                                <dataRef name="gYear"/>
+                            </datatype>
+                        </attDef>
+                    </attList>
+                </elementSpec>
+                
                 <elementSpec ident="char">
                     <content>
                         <rng:optional>
@@ -1418,6 +1431,14 @@
                     </attList>
                 </elementSpec>
                 
+                <elementSpec ident="revisionDesc">
+                    <content>
+                        <rng:oneOrMore>
+                            <rng:ref name="change"/>
+                        </rng:oneOrMore>
+                    </content>
+                </elementSpec>
+                
                 <elementSpec ident="sic">
                     <content>
                         <rng:oneOrMore>
@@ -1480,6 +1501,9 @@
                         <rng:ref name="fileDesc"/>
                         <rng:ref name="encodingDesc"/>
                         <rng:ref name="profileDesc"/>
+                        <rng:optional>
+                            <rng:ref name="revisionDesc"/>
+                        </rng:optional>
                     </content>
                 </elementSpec>