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-rw-r--r--docs/manual/style/manualpage.dtd4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/manual/style/manualpage.dtd b/docs/manual/style/manualpage.dtd
index 17742548..e9c22a04 100644
--- a/docs/manual/style/manualpage.dtd
+++ b/docs/manual/style/manualpage.dtd
@@ -24,4 +24,6 @@
<!ELEMENT manualpage (parentdocument?, title, summary?,
seealso*, section*)>
-<!ATTLIST manualpage metafile CDATA #REQUIRED>
+<!ATTLIST manualpage metafile CDATA #REQUIRED
+ upgrade CDATA #IMPLIED
+>