diff --git a/appl/popper/README-FIRST b/appl/popper/README-FIRST
index 98c1e53e4..7b706bca3 100644
--- a/appl/popper/README-FIRST
+++ b/appl/popper/README-FIRST
@@ -1,2 +1,10 @@
 This kerberized popper was based on popper-1.831beta
 which was later announced as "offical" and not beta.
+
+Please note that the server principal is pop.hostname and not
+rcmd.hostname. I.e an additional entry is needed in your mailhub's
+/etc/srvtab. Use ksrvutil and kadmin to add the extra prinicpal.
+
+The server is usually started from inetd and there is already an entry
+for that in inetd.conf.changes.
+