diff --git a/src/xspice/icm/xtradev/pswitch/ifspec.ifs b/src/xspice/icm/xtradev/pswitch/ifspec.ifs
index 33e95d5e8..bf66557a9 100644
--- a/src/xspice/icm/xtradev/pswitch/ifspec.ifs
+++ b/src/xspice/icm/xtradev/pswitch/ifspec.ifs
@@ -8,7 +8,7 @@ Copyright 2020 The ngspice team
 AUTHORS                      
 
     27 September 2020     Holger Vogt
-
+    03 June 2021          Yurii Demchyna
 
 SUMMARY