diff --git a/reference/xsl/xsltprocessor/setparameter.xml b/reference/xsl/xsltprocessor/setparameter.xml
index b1579a716f93..0bede24ffe69 100644
--- a/reference/xsl/xsltprocessor/setparameter.xml
+++ b/reference/xsl/xsltprocessor/setparameter.xml
@@ -70,6 +70,14 @@
   </para>
  </refsect1>
 
+ <refsect1 role="errors">
+  &reftitle.errors;
+  <simpara>
+   Throws a <exceptionname>ValueError</exceptionname> if any of the arguments
+   contain null bytes.
+  </simpara>
+ </refsect1>
+
  <refsect1 role="changelog">
   &reftitle.changelog;
   <informaltable>
@@ -81,6 +89,13 @@
      </row>
     </thead>
     <tbody>
+     <row>
+      <entry>8.4.0</entry>
+      <entry>
+       Now throws a <exceptionname>ValueError</exceptionname> if any of the
+       arguments contain null bytes instead of silently truncating.
+      </entry>
+     </row>
      <row>
       <entry>8.4.0</entry>
       <entry>