diff --git a/app/Types.hs b/app/Types.hs
index f9d7942..bf5f780 100644
--- a/app/Types.hs
+++ b/app/Types.hs
@@ -47,7 +47,8 @@ data EpubEnv = EpubEnv
     baseDir :: FilePath,
     bookPath :: FilePath,
     eMetadata :: DMeta.Metadata,
-    eManifest :: DMan.Manifest
+    eManifest :: DMan.Manifest,
+    eVersion :: T.Text
   }
 
 data ChapterView = ChapterView