diff --git a/README.rdoc b/README.rdoc
index de7f8b3..62a3255 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -266,6 +266,20 @@ corner cases a little harder to test. In general if you are using procs or
 model methods and you only care when they return  a value, then they should 
 return nil in all other situations. Restrictions are skipped if they are nil.
 
+
+=== DISPLAY INVALID VALUES IN DATE HELPERS:
+
+The plugin has some extensions to ActionView and ActiveRecord by allowing invalid
+date and time values to be redisplayed to the user as feedback, instead of
+a blank field which happens by default in Rails. Though the date helpers make this a
+pretty rare occurence, given the select dropdowns for each date/time component, but
+it may be something of interest.
+
+To activate it, put this in an initializer:
+
+  ValidatesTimeliness.enable_datetime_select_extension!
+
+
 === OTHER CUSTOMISATION:
 
 The error messages for each temporal restrictions can also be globally overridden by