diff --git a/app/Persistence.hs b/app/Persistence.hs
new file mode 100644
index 0000000..c4b0998
--- /dev/null
+++ b/app/Persistence.hs
@@ -0,0 +1,4 @@
+module Persistence where
+
+-- TODO: Add book state persistence
+
diff --git a/svitak.cabal b/svitak.cabal
index 05ebcd4..e0bf856 100644
--- a/svitak.cabal
+++ b/svitak.cabal
@@ -59,7 +59,8 @@ executable svitak
 
     other-modules:    EpubParser,
                       Gui,
-                      UI
+                      UI,
+                      Persistence
 
     build-depends:    base ^>=4.21.0.0,
                       bytestring >= 0.12.2.0,