diff --git a/reference/filter/filters.xml b/reference/filter/filters.xml
index 860df59fd4..3ab749062b 100644
--- a/reference/filter/filters.xml
+++ b/reference/filter/filters.xml
@@ -427,7 +427,7 @@
        <entry>
         Regards inputs starting with <literal>0x</literal> or
         <literal>0X</literal> as hexadecimal numbers. This only allows
-        succeeding characters to be <literal>a-hA-H0-9</literal>.
+        succeeding characters to be <literal>a-fA-F0-9</literal>.
        </entry>
       </row>
       <row>