diff --git a/src/test/perl/PostgreSQL/Test/Cluster.pm b/src/test/perl/PostgreSQL/Test/Cluster.pm
index fe6ebf10f76..5b583264ef1 100644
--- a/src/test/perl/PostgreSQL/Test/Cluster.pm
+++ b/src/test/perl/PostgreSQL/Test/Cluster.pm
@@ -2837,7 +2837,7 @@ sub lsn
 
 =pod
 
-=item $node->wait_for_event(wait_event_name, backend_type)
+=item $node->wait_for_event(backend_type, wait_event_name)
 
 Poll pg_stat_activity until backend_type reaches wait_event_name.