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-rw-r--r--doc/src/sgml/docguide.sgml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/src/sgml/docguide.sgml b/doc/src/sgml/docguide.sgml
index 420a2f9d6e5..baa88b2fcef 100644
--- a/doc/src/sgml/docguide.sgml
+++ b/doc/src/sgml/docguide.sgml
@@ -80,7 +80,7 @@
<variablelist>
<varlistentry>
- <term><ulink url="http://www.oasis-open.org/docbook/">DocBook DTD</ulink></term>
+ <term><ulink url="https://www.oasis-open.org/docbook/">DocBook DTD</ulink></term>
<listitem>
<para>
This is the definition of DocBook itself. We currently use version