diff --git a/plugins/calendar/lib/get_horde_icalendar.sh b/plugins/calendar/lib/get_horde_icalendar.sh
index 07b76088..1992bf27 100755
--- a/plugins/calendar/lib/get_horde_icalendar.sh
+++ b/plugins/calendar/lib/get_horde_icalendar.sh
@@ -16,6 +16,7 @@ echo "<?php
 /**
  * This is a concatenated copy of the following files:
  *   Horde/String.php, Horde/iCalendar.php, Horde/iCalendar/*.php
+ * Pull the latest version of these file from the PEAR channel of the Horde project at http://pear.horde.org
  */
 
 require_once(dirname(__FILE__) . '/Horde_Date.php');"
diff --git a/plugins/libkolab/README b/plugins/libkolab/README
index a60d5487..b44d4d2b 100644
--- a/plugins/libkolab/README
+++ b/plugins/libkolab/README
@@ -18,3 +18,23 @@ REQUIREMENTS
 * Optional for old format support:
   Horde Kolab_Format package and all of its dependencies
   which are at least Horde_(Browser,DOM,NLS,String,Utils)
+
+
+INSTALLATION
+------------
+To use local cache you need to create a dedicated table in Roundcube's database.
+To do so, execute the SQL commands in SQL/<yourdatabase>.sql
+
+
+CONFIGURATION
+-------------
+The following options can be configured in Roundcube's main config file
+or a local config file (config.inc.php) located in the plugin folder.
+
+// Enable caching of Kolab objects in local database
+$rcmail_config['kolab_cache'] = true;
+
+// Optional override of the URL to read and trigger Free/Busy information of Kolab users
+// Defaults to https://<imap-server->/freebusy
+$rcmail_config['kolab_freebusy_server'] = 'https://<some-host>/<freebusy-path>';
+