diff --git a/freedesktop.org.xml.in b/freedesktop.org.xml.in
index 2ba7f72..c5cf496 100644
--- a/freedesktop.org.xml.in
+++ b/freedesktop.org.xml.in
@@ -84,7 +84,24 @@ command to generate the output files.
     <expanded-acronym>Andrew Toolkit</expanded-acronym>
     <generic-icon name="x-office-document"/>
     <glob pattern="*.ez"/>
+</mime-type>
+  <mime-type type="application/x-chiasmus-encrypted">
+    <_comment>Chiasmus-encrypted data</_comment>
+    <magic priority="50">
+	<match type="string" value="XIA1" offset="0">
+	</match>
+    </magic>
+    <glob pattern="*.xia"/>
+  </mime-type>
+ <mime-type type="application/x-chiasmus-key">
+    <_comment>Chiasmus key</_comment>
+    <magic priority="50">
+      <match type="string" value="XSI" offset="0">
+	</match>
+    </magic>
+    <glob pattern="*.xsi"/>
   </mime-type>
+
   <mime-type type="application/epub+zip">
     <_comment>electronic book document</_comment>
     <sub-class-of type="application/zip"/>