diff --git a/README.rst b/README.rst
index 48e8898..60ae5bb 100644
--- a/README.rst
+++ b/README.rst
@@ -23,13 +23,26 @@ CardDAV/CalDAV Server Support
 =============================
 
 vdirsyncer is currently tested against the latest versions of Radicale and
-ownCloud. While Radicale seems to work perfectly, ownCloud currently has
-problems detecting collisions and race-conditions. However, given that this is
-a problem with every setup involving ownCloud, and that ownCloud is widely
-used, it apparently isn't big enough of a problem yet.
+ownCloud.
 
-See `Bug #16 <https://github.com/untitaker/vdirsyncer/issues/16>`_ for
-informations on problems with ownCloud.
+Radicale
+--------
+
+Radicale doesn't `support time ranges in the calendar-query of CalDAV/CardDAV
+<https://github.com/Kozea/Radicale/issues/146>`_, so setting ``start_date`` and
+``end_date`` in vdirsyncer's configuration will have no or unpredicted
+consequences.
+
+ownCloud
+--------
+
+ownCloud uses SabreDAV, which had problems detecting collisions and
+race-conditions. The problems were reported and are fixed in SabreDAV's repo.
+See `Bug #16 <https://github.com/untitaker/vdirsyncer/issues/16>`_ for more
+information.
+
+However, given that this is a problem with every setup involving ownCloud, and
+that ownCloud is widely used, it apparently isn't big enough of a problem yet.
 
 How to use
 ==========