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-rw-r--r--nixos/doc/manual/options-to-docbook.xsl5
1 files changed, 5 insertions, 0 deletions
diff --git a/nixos/doc/manual/options-to-docbook.xsl b/nixos/doc/manual/options-to-docbook.xsl
index 73c905fbca16..791455fafbd8 100644
--- a/nixos/doc/manual/options-to-docbook.xsl
+++ b/nixos/doc/manual/options-to-docbook.xsl
@@ -94,6 +94,11 @@
   </xsl:template>
 
 
+  <xsl:template match="null">
+    <xsl:text>null</xsl:text>
+  </xsl:template>
+
+
   <xsl:template match="string">
     <!-- !!! escaping -->
     <xsl:text>"</xsl:text><xsl:value-of select="str:replace(str:replace(str:replace(@value, '\', '\\'), '&quot;', '\&quot;'), '&#010;', '\n')" /><xsl:text>"</xsl:text>