diff --git a/doc/src/sgml/ref/create_event_trigger.sgml b/doc/src/sgml/ref/create_event_trigger.sgml
index 040df11..3088ffa 100644
--- a/doc/src/sgml/ref/create_event_trigger.sgml
+++ b/doc/src/sgml/ref/create_event_trigger.sgml
@@ -23,7 +23,7 @@ PostgreSQL documentation
 <synopsis>
 CREATE EVENT TRIGGER <replaceable class="PARAMETER">name</replaceable>
   ON <replaceable class="PARAMETER">event</replaceable>
-  [ WHEN <replaceable class="PARAMETER">filter_variable</replaceable> IN (filter_value [ AND ... ] ) ]
+  [ WHEN <replaceable class="PARAMETER">filter_variable</replaceable> IN (filter_value [, ... ]) [ AND ... ] ]
   EXECUTE PROCEDURE <replaceable class="PARAMETER">function_name</replaceable>()
 </synopsis>
  </refsynopsisdiv>