diff --git a/mail/courier-imap/files/pkg-message.in b/mail/courier-imap/files/pkg-message.in
index 955be79ecc01..b199e8f11f09 100644
--- a/mail/courier-imap/files/pkg-message.in
+++ b/mail/courier-imap/files/pkg-message.in
@@ -1,17 +1,23 @@
 [
 { type: install
   message: <<EOM
 In case you use authpam, you should put the following lines
 in your /etc/pam.d/imap:
 
 auth    required    pam_unix.so         try_first_pass
 account required    pam_unix.so         try_first_pass
 session required    pam_permit.so
 
 You will have to run %%DATADIR%%/mkimapdcert to create
 a self-signed certificate if you want to use imapd-ssl.
 And you will have to copy and edit the *.dist files to *
 in %%CONFDIR%%.
+
+If you have maildirs with a lot of messages
+(indicatively > 120000), imapd could exhaust memory while
+scanning them.
+If you see the imapd process crash with SIGABRT try
+incrasing the ULIMIT setting in imapd configuration file.
 EOM
 }
 ]