diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index 3c806df7356b21cea387f96926e79bdebc40d317..f285453ff89a056802df954949815caad31eb81b 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -1069,6 +1069,9 @@ alias mystep='step ssh login example@email.com --provisioner "keycloak"'
 
 Whereupon you'll be good for another twelve hours. The above command is a great candidate for a shell alias.
 
+# 6 june 2024
+:kooistra@dop466:/dop466_0/kooistra$ ssh bastion.astron.nl -D localhost:12000 -N -f
+kooistra@bastion.astron.nl: Permission denied (publickey).
 
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 * Regression test