diff --git a/README.txt b/README.txt
index 0d111b4..d62667e 100644
--- a/README.txt
+++ b/README.txt
@@ -9,6 +9,9 @@ not the database and lives at http://expo.survex.com/repositories/troggle/.git/
 See copyright notices in
 http://expo.survex.com/handbook/computing/contribute.html
 
+See online documentation at http://expo.survex.com/handbook/troggle/serverconfig.html
+and at troggle/debian/serversetup .
+
 Troggle setup
 =============
 1. git clone troggle into correct directory structure
diff --git a/debian/serversetup b/debian/serversetup
index c3b44a5..644baea 100644
--- a/debian/serversetup
+++ b/debian/serversetup
@@ -1,6 +1,11 @@
 Instructions for setting up new expo debian server/VM
 For Debian Stretch, June 2019.
 
+[Note added March 2021:
+See also http://expo.survex.com/handbook/troggle/serverconfig.html
+and troggle/README.txt
+]
+
 adduser expo
 apt install openssh-server mosh tmux mc zile emacs-nox mc most ncdu
 apt install python-django apache2 mysql-server survex make rsync