diff --git a/indexation.cabal b/indexation.cabal
--- a/indexation.cabal
+++ b/indexation.cabal
@@ -1,5 +1,5 @@
 name: indexation
-version: 0.4
+version: 0.4.1
 category: Data
 synopsis: Tools for entity indexation
 description: A set of tools for indexing entities
diff --git a/library/Indexation/Data.hs b/library/Indexation/Data.hs
--- a/library/Indexation/Data.hs
+++ b/library/Indexation/Data.hs
@@ -4,6 +4,7 @@
   EntityTable,
   Indexer,
   lookupEntity,
+  lookupIndex,
 )
 where
 
@@ -11,8 +12,13 @@
 import Indexation.Types
 import Indexation.Instances ()
 import qualified Data.Vector as Vector
+import qualified Data.HashMap.Strict as HashMap
 
 
 lookupEntity :: Index entity -> EntityTable entity -> Maybe entity
 lookupEntity (Index indexPrim) (EntityTable vector) =
   vector Vector.!? indexPrim
+
+lookupIndex :: (Eq entity, Hashable entity) => entity -> IndexTable entity -> Maybe (Index entity)
+lookupIndex entity (IndexTable _ hashMap) =
+  fmap Index (HashMap.lookup entity hashMap)
diff --git a/library/Indexation/IO.hs b/library/Indexation/IO.hs
--- a/library/Indexation/IO.hs
+++ b/library/Indexation/IO.hs
@@ -9,6 +9,7 @@
   serializeIndexerToFile,
   readEntitiesAmountFromEntityTableFile,
   readEntityTableFromFile,
+  readIndexTableFromFile,
 )
 where
 
@@ -68,6 +69,12 @@
 
 readEntityTableFromFile :: Serialize entity => FilePath -> IO (Either IOException (Either Text (EntityTable entity)))
 readEntityTableFromFile filePath =
+  PotokiIo.produceAndConsume
+    (PotokiProduce.fileBytes filePath)
+    (right' (PotokiConsume.get Cereal.get))
+
+readIndexTableFromFile :: (Serialize entity, Eq entity, Hashable entity) => FilePath -> IO (Either IOException (Either Text (IndexTable entity)))
+readIndexTableFromFile filePath =
   PotokiIo.produceAndConsume
     (PotokiProduce.fileBytes filePath)
     (right' (PotokiConsume.get Cereal.get))