MFB: Date_Holidays version requirement.

diff --git a/kronolith/docs/UPGRADING b/kronolith/docs/UPGRADING
index d13effa..0612cf8 100644 (file)
--- a/kronolith/docs/UPGRADING
+++ b/kronolith/docs/UPGRADING
@@ -12,6 +12,13 @@ backup your existing data before running any of the steps described below. You
 can't use the updated data with your old Kronolith version anymore.
 
 
+Upgrading Kronolith from 2.3 to 2.3.x
+=====================================
+
+If you want to use the holidays feature, at least version 0.21.0 of
+Date_Holidays is required now.
+
+
 Upgrading Kronolith from 2.3.x to 3.0.x
 =======================================