diff --git a/offlineimap.conf b/offlineimap.conf
index ce6d17b..9263df7 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -207,6 +207,14 @@ restoreatime = no
 
 type = IMAP
 
+# The following can fetch the account credentials via a python expression that
+# is parsed from the pythonfile parameter. For example, a function called
+# "getcredentials" that parses a file "filename" and returns the account
+# details for "hostname".
+# remotehosteval = getcredentials("filename", "hostname", "hostname")
+# remoteusereval = getcredentials("filename", "hostname", "user")
+# remotepasseval = getcredentials("filename", "hostname", "passwd")
+
 # Specify the remote hostname.
 remotehost = examplehost