diff --git a/Data/Dates.hs b/Data/Dates.hs
--- a/Data/Dates.hs
+++ b/Data/Dates.hs
@@ -6,7 +6,10 @@
    parseDate,
    pDate, pDateTime,
    getCurrentDateTime,
-   tryRead
+   tryRead,
+   DateIntervalType (..),
+   DateInterval (..),
+   addInterval
   ) where
 
 import Prelude.Unicode
diff --git a/dates.cabal b/dates.cabal
--- a/dates.cabal
+++ b/dates.cabal
@@ -1,5 +1,5 @@
 name:                dates
-version:             0.2.0.0
+version:             0.2.0.1
 synopsis:            Small library for parsing different dates formats.
 description:         This package allows to parse many different formats
                      of dates. Both absolute and relative dates are supported.