diff --git a/Data/HEPEVT.hs b/Data/HEPEVT.hs
--- a/Data/HEPEVT.hs
+++ b/Data/HEPEVT.hs
@@ -8,7 +8,7 @@
 
 -}
 module Data.HEPEVT (
-  Event,
+  Event, Particle(..),
 
   parseEventFile,
   parseEvents,
diff --git a/hepevt.cabal b/hepevt.cabal
--- a/hepevt.cabal
+++ b/hepevt.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.3
+Version:             0.3.1
 
 -- A short (one-line) description of the package.
 Synopsis:            HEPEVT parser and writer