diff --git a/core/src/Streamly/Data/Array.hs b/core/src/Streamly/Data/Array.hs
index 247bf9227..476976e30 100644
--- a/core/src/Streamly/Data/Array.hs
+++ b/core/src/Streamly/Data/Array.hs
@@ -9,7 +9,13 @@
 --
 -- This module provides APIs to create and use unboxed immutable arrays. Once
 -- created, their contents cannot be modified. Only types that are unboxable
--- via the 'Unbox' type class can be stored in these arrays.
+-- via the 'Unbox' type class can be stored in these arrays. Note that the
+-- array memory grows automatically when creating a new array, therefore, an
+-- array can be created from a variable length stream.
+--
+-- See "Streamly.Data.Array.Generic" for arrays that work for boxed types i.e.
+-- not requiring the 'Unbox' constraint.
+-- See "Streamly.Data.MutArray" for arrays that can be mutated in-place..
 --
 -- = Folding Arrays
 --
@@ -55,6 +61,9 @@
 -- >>> Stream.fold (purely Array.write) $ Stream.fromList [1,2,3::Int]
 -- Identity fromList [1,2,3]
 --
+-- Since it is a pure stream we can use 'unsafePerformIO' to extract the result
+-- of fold from IO.
+--
 -- Alternatively, 'Identity' streams can be generalized to IO streams:
 --
 -- >>> pure = Stream.fromList [1,2,3] :: Stream Identity Int
@@ -62,9 +71,6 @@
 -- >>> Stream.fold Array.write (generally pure :: Stream IO Int)
 -- fromList [1,2,3]
 --
--- Since it is a pure stream we can use 'unsafePerformIO' to extract the result
--- of fold from IO.
---
 -- = Programming Tips
 --
 -- This module is designed to be imported qualified:
diff --git a/core/src/Streamly/Data/MutArray.hs b/core/src/Streamly/Data/MutArray.hs
index 4318fc33a..db147a32e 100644
--- a/core/src/Streamly/Data/MutArray.hs
+++ b/core/src/Streamly/Data/MutArray.hs
@@ -7,9 +7,12 @@
 -- Stability   : released
 -- Portability : GHC
 --
--- This module provides mutable arrays suitable for long lived data storage,
--- random access, and mutation.
+-- Mutable version of "Streamly.Data.Array". Please refer to that module for
+-- general documentation. The contents of mutable ararys can be modified
+-- in-place.
 --
+-- See "Streamly.Data.MutArray.Generic" for mutable arrays that work for boxed
+-- types i.e. not requiring the 'Unbox' constraint.
 
 module Streamly.Data.MutArray
     (
diff --git a/core/src/Streamly/Data/MutArray/Generic.hs b/core/src/Streamly/Data/MutArray/Generic.hs
index e7e621481..ac48560a6 100644
--- a/core/src/Streamly/Data/MutArray/Generic.hs
+++ b/core/src/Streamly/Data/MutArray/Generic.hs
@@ -6,7 +6,9 @@
 -- Stability   : experimental
 -- Portability : GHC
 --
--- Mutable variant of the "Streamly.Data.Array.Generic" module.
+-- Unconstrained version of "Streamly.Data.MutArray" module.
+--
+-- See the "Streamly.Data.MutArray" module for documentation.
 --
 module Streamly.Data.MutArray.Generic
 (