diff --git a/library/System/OsRelease.hs b/library/System/OsRelease.hs
--- a/library/System/OsRelease.hs
+++ b/library/System/OsRelease.hs
@@ -8,6 +8,7 @@
     , OsReleaseKey (..)
     , OsReleaseLine
     , OsRelease
+    , OsReleaseError
     )
 where
 
diff --git a/os-release.cabal b/os-release.cabal
--- a/os-release.cabal
+++ b/os-release.cabal
@@ -9,7 +9,7 @@
 homepage:       https://github.com/yaccz/os-release
 name:           os-release
 synopsis:       /etc/os-release helpers
-version:        0.2.0
+version:        0.2.1
 description:    /etc/os-release helpers