diff --git a/plugins/calendar/README b/plugins/calendar/README
index 78c84a96..758fb1bb 100644
--- a/plugins/calendar/README
+++ b/plugins/calendar/README
@@ -69,4 +69,10 @@ Add 'calendar' to the list of active plugins:
   );
 
 
+IMPORTANT
+---------
+
+This plugin doesn't work with the classic skin of Roundcube because no
+templates are available for that skin.
+
 [1] https://git.kolab.org/diffusion/RPK/
diff --git a/plugins/libkolab/README b/plugins/libkolab/README
index 2f948390..e30ab030 100644
--- a/plugins/libkolab/README
+++ b/plugins/libkolab/README
@@ -6,6 +6,8 @@ and manage the access to the Kolab groupware objects stored in various
 IMAP folders. For reading and writing these objects, the PHP bindings of
 the libkolabxml library are used.
 
+This plugin also provides elastic/larry skin support for Kolab plugins.
+
 
 REQUIREMENTS
 ------------
@@ -26,3 +28,10 @@ CONFIGURATION
 -------------
 Rename config.inc.php.dist to config.inc.php in the plugin folder.
 For available configuration options see config.inc.php.dist file.
+
+
+IMPORTANT
+---------
+
+This plugin doesn't work with the classic skin of Roundcube because no
+templates are available for that skin.
\ No newline at end of file