diff --git a/contracts/StorageContract.sol b/contracts/StorageContract.sol
index fef4ee4..dc0b755 100644
--- a/contracts/StorageContract.sol
+++ b/contracts/StorageContract.sol
@@ -6,6 +6,7 @@ import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
 contract StorageContract {
   uint public immutable duration; // contract duration in seconds
   uint public immutable size; // storage size in bytes
+  bytes32 public immutable contentHash; // hash of data that is to be stored
   uint public immutable price; // price in coins
   address public immutable host; // host that provides storage
   uint public immutable proofPeriod; // average time between proofs (in blocks)
@@ -14,6 +15,7 @@ contract StorageContract {
 
   constructor(uint _duration,
               uint _size,
+              bytes32 _contentHash,
               uint _price,
               uint _proofPeriod,
               uint _proofTimeout,
@@ -21,7 +23,13 @@ contract StorageContract {
               bytes memory requestSignature,
               bytes memory bidSignature)
   {
-    bytes32 requestHash = hashRequest(_duration, _size, _proofPeriod, _proofTimeout);
+    bytes32 requestHash = hashRequest(
+      _duration,
+      _size,
+      _contentHash,
+      _proofPeriod,
+      _proofTimeout
+    );
     bytes32 bidHash = hashBid(requestHash, _price);
     checkSignature(requestSignature, requestHash, msg.sender);
     checkSignature(bidSignature, bidHash, _host);
@@ -29,6 +37,7 @@ contract StorageContract {
     duration = _duration;
     size = _size;
     price = _price;
+    contentHash = _contentHash;
     host = _host;
     proofPeriod = _proofPeriod;
     proofTimeout = _proofTimeout;
@@ -36,7 +45,13 @@ contract StorageContract {
   }
 
   // Creates hash for a storage request that can be used to check its signature.
-  function hashRequest(uint _duration, uint _size, uint _proofPeriod, uint _proofTimeout)
+  function hashRequest(
+    uint _duration,
+    uint _size,
+    bytes32 _hash,
+    uint _proofPeriod,
+    uint _proofTimeout
+  )
     internal pure
     returns (bytes32)
   {
@@ -44,6 +59,7 @@ contract StorageContract {
       "[dagger.request.v1]",
       _duration,
       _size,
+      _hash,
       _proofPeriod,
       _proofTimeout
     ));
diff --git a/test/StorageContract.test.js b/test/StorageContract.test.js
index aff1179..511672c 100644
--- a/test/StorageContract.test.js
+++ b/test/StorageContract.test.js
@@ -6,6 +6,7 @@ describe("Storage Contract", function () {
 
   const duration = 31 * 24 * 60 * 60 // 31 days
   const size = 1 * 1024 * 1024 * 1024 // 1 Gigabyte
+  const contentHash = ethers.utils.sha256("0xdeadbeef") // hash of content
   const proofPeriod = 8 // 8 blocks ≈ 2 minutes
   const proofTimeout = 4 // 4 blocks ≈ 1 minute
   const price = 42
@@ -18,7 +19,13 @@ describe("Storage Contract", function () {
   beforeEach(async function () {
     [client, host] = await ethers.getSigners()
     StorageContract = await ethers.getContractFactory("StorageContract")
-    requestHash = hashRequest(duration, size, proofPeriod, proofTimeout)
+    requestHash = hashRequest(
+      duration,
+      size,
+      contentHash,
+      proofPeriod,
+      proofTimeout
+    )
     bidHash = hashBid(requestHash, price)
   })
 
@@ -28,6 +35,7 @@ describe("Storage Contract", function () {
       contract = await StorageContract.deploy(
         duration,
         size,
+        contentHash,
         price,
         proofPeriod,
         proofTimeout,
@@ -45,6 +53,10 @@ describe("Storage Contract", function () {
       expect(await contract.size()).to.equal(size)
     })
 
+    it("contains the hash of the data that is to be stored", async function () {
+      expect(await contract.contentHash()).to.equal(contentHash)
+    })
+
     it("has a price", async function () {
       expect(await contract.price()).to.equal(price)
     })
@@ -63,11 +75,18 @@ describe("Storage Contract", function () {
   })
 
   it("cannot be created when client signature is invalid", async function () {
-    let invalidHash = hashRequest(duration + 1, size, proofPeriod, proofTimeout)
+    let invalidHash = hashRequest(
+      duration + 1,
+      size,
+      contentHash,
+      proofPeriod,
+      proofTimeout
+    )
     let invalidSignature = await sign(client, invalidHash)
     await expect(StorageContract.deploy(
       duration,
       size,
+      contentHash,
       price,
       proofPeriod,
       proofTimeout,
@@ -82,6 +101,7 @@ describe("Storage Contract", function () {
     await expect(StorageContract.deploy(
       duration,
       size,
+      contentHash,
       price,
       proofPeriod,
       proofTimeout,
@@ -93,11 +113,18 @@ describe("Storage Contract", function () {
 
   it("cannot be created when proof timeout is too large", async function () {
     let invalidTimeout = 129 // max proof timeout is 128 blocks
-    requestHash = hashRequest(duration, size, proofPeriod, invalidTimeout)
+    requestHash = hashRequest(
+      duration,
+      size,
+      contentHash,
+      proofPeriod,
+      invalidTimeout
+    )
     bidHash = hashBid(requestHash, price)
     await expect(StorageContract.deploy(
       duration,
       size,
+      contentHash,
       price,
       proofPeriod,
       invalidTimeout,
@@ -127,6 +154,7 @@ describe("Storage Contract", function () {
       contract = await StorageContract.deploy(
         duration,
         size,
+        contentHash,
         price,
         proofPeriod,
         proofTimeout,
@@ -161,7 +189,6 @@ describe("Storage Contract", function () {
   })
 })
 
-// TDOO: add root hash of data
 // TODO: payment on constructor
 // TODO: contract start and timeout
 // TODO: missed proofs
diff --git a/test/marketplace.js b/test/marketplace.js
index 5a2e078..2aad7cc 100644
--- a/test/marketplace.js
+++ b/test/marketplace.js
@@ -1,9 +1,9 @@
 const { ethers } = require("hardhat")
 
-function hashRequest(duration, size, proofPeriod, proofTimeout) {
+function hashRequest(duration, size, hash, proofPeriod, proofTimeout) {
   return ethers.utils.solidityKeccak256(
-    ["string", "uint", "uint", "uint", "uint"],
-    ["[dagger.request.v1]", duration, size, proofPeriod, proofTimeout]
+    ["string", "uint", "uint", "bytes32", "uint", "uint"],
+    ["[dagger.request.v1]", duration, size, hash, proofPeriod, proofTimeout]
   )
 }