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diff --git a/Constants.hs b/Constants.hs
index 380a745..60aba4e 100644
--- a/Constants.hs
+++ b/Constants.hs
@@ -165,12 +165,18 @@ mapId = "map"
 zipWithId :: String
 zipWithId = "zipWith"
 
+-- | foldl function identifier
 foldlId :: String
 foldlId = "foldl"
 
+-- | foldr function identifier
 foldrId :: String
 foldrId = "foldr"
 
+-- | zip function identifier
+zipId :: String
+zipId = "zip"
+
 -- | hwxor function identifier
 hwxorId :: String
 hwxorId = "hwxor"