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-rw-r--r--doc/manual/writing-nix-expressions.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/manual/writing-nix-expressions.xml b/doc/manual/writing-nix-expressions.xml
index cf590190ca56..e8d84164e3df 100644
--- a/doc/manual/writing-nix-expressions.xml
+++ b/doc/manual/writing-nix-expressions.xml
@@ -1769,7 +1769,7 @@ in foo</programlisting>
   </varlistentry>
 
   
-  <varlistentry><term><function>builtins.toXML</function> <replaceable>e</replaceable></term>
+  <varlistentry xml:id='builtin-toXML'><term><function>builtins.toXML</function> <replaceable>e</replaceable></term>
 
     <listitem><para>Return a string containing an XML representation
     of <replaceable>e</replaceable>.  The main application for