diff --git a/reference/filter/constants.xml b/reference/filter/constants.xml
index 91e1402a3a82..a856d6f2c367 100644
--- a/reference/filter/constants.xml
+++ b/reference/filter/constants.xml
@@ -189,7 +189,7 @@
    </term>
    <listitem>
     <simpara>
-     Strips backtick (<literal>`</literal> characters.
+     Strips backtick (<literal>`</literal>) characters.
     </simpara>
    </listitem>
   </varlistentry>