diff --git a/CHANGELOG.md b/CHANGELOG.md
index adcbd6db3..d2b21d082 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,8 @@ to these calls.
 
 - HTTP Changes:
   - Wallet and account create methods now accept `lookahead` values up to `2^32 - 1`.
+  - Create account is now: `POST /wallet/:id/account/:account` instead of `PUT /wallet/:id/account/:account`.
+  - Introduce new API to modify account: `PUT /wallet/:id/account/:account`. (old create)
 
 - New RPC methods:
   - `createbatch` and `sendbatch` create batch transactions with any number
diff --git a/bin/hsw-cli b/bin/hsw-cli
index 163fb9763..3dcd5c7d4 100755
--- a/bin/hsw-cli
+++ b/bin/hsw-cli
@@ -21,6 +21,7 @@ const HELP = `
 Commands:
   $ abandon [hash]: Abandon a transaction.
   $ account create [account-name]: Create account.
+  $ account modify [account-name]: Set account options.
   $ account get [account-name]: Get account details.
   $ account list: List account names.
   $ address [account-name]: Derive new address.
@@ -233,6 +234,18 @@ class CLI {
     this.log(account);
   }
 
+  async modifyAccount() {
+    const name = this.config.str([0, 'name']);
+
+    const options = {
+      lookahead: this.config.uint('lookahead')
+    };
+
+    const account = await this.wallet.modifyAccount(name, options);
+
+    this.log(account);
+  }
+
   async createAddress() {
     const account = this.config.str([0, 'account']);
     const addr = await this.wallet.createAddress(account);
@@ -579,6 +592,11 @@ class CLI {
           await this.createAccount();
           break;
         }
+        if (this.argv[0] === 'modify') {
+          this.argv.shift();
+          await this.modifyAccount();
+          break;
+        }
         if (this.argv[0] === 'get')
           this.argv.shift();
         await this.getAccount();
diff --git a/lib/client/wallet.js b/lib/client/wallet.js
index 0a9bc7b84..f6b7d6b9f 100644
--- a/lib/client/wallet.js
+++ b/lib/client/wallet.js
@@ -682,6 +682,21 @@ class WalletClient extends Client {
    */
 
   createAccount(id, name, options) {
+    if (name == null)
+      throw new Error('Account name is required.');
+
+    return this.post(`/wallet/${id}/account/${name}`, options);
+  }
+
+  /**
+   * Modify account.
+   * @param {String} id
+   * @param {String} name
+   * @param {Object} options
+   * @returns {Promise<Object>}
+   */
+
+  modifyAccount(id, name, options) {
     return this.put(`/wallet/${id}/account/${name}`, options);
   }
 
@@ -1363,12 +1378,20 @@ class Wallet extends EventEmitter {
    */
 
   createAccount(name, options) {
-    if (name == null)
-      throw new Error('Account name is required.');
-
     return this.client.createAccount(this.id, name, options);
   }
 
+  /**
+   * Modify account.
+   * @param {String} name
+   * @param {Object} options
+   * @returns {Promise<Object>}
+   */
+
+  modifyAccount(name, options) {
+    return this.client.modifyAccount(this.id, name, options);
+  }
+
   /**
    * Create address.
    * @param {Object} options
diff --git a/lib/wallet/account.js b/lib/wallet/account.js
index be18c4d26..d60c7903b 100644
--- a/lib/wallet/account.js
+++ b/lib/wallet/account.js
@@ -563,6 +563,8 @@ class Account extends bio.Struct {
    */
 
   async setLookahead(b, lookahead) {
+    assert((lookahead >>> 0) === lookahead, 'Lookahead must be a number.');
+
     if (lookahead === this.lookahead)
       return;
 
diff --git a/lib/wallet/http.js b/lib/wallet/http.js
index 1e192fb10..9175ce7dc 100644
--- a/lib/wallet/http.js
+++ b/lib/wallet/http.js
@@ -337,7 +337,7 @@ class HTTP extends Server {
     });
 
     // Create account
-    this.put('/wallet/:id/account/:account', async (req, res) => {
+    this.post('/wallet/:id/account/:account', async (req, res) => {
       const valid = Validator.fromRequest(req);
       const passphrase = valid.str('passphrase');
 
@@ -362,6 +362,22 @@ class HTTP extends Server {
       res.json(200, account.getJSON(balance));
     });
 
+    // Modify account
+    this.put('/wallet/:id/account/:account', async (req, res) => {
+      const valid = Validator.fromRequest(req);
+      const passphrase = valid.str('passphrase');
+      const acct = valid.str('account');
+
+      const options = {
+        lookahead: valid.u32('lookahead')
+      };
+
+      const account = await req.wallet.modifyAccount(acct, options, passphrase);
+      const balance = await req.wallet.getBalance(account.accountIndex);
+
+      res.json(200, account.getJSON(balance));
+    });
+
     // Change passphrase
     this.post('/wallet/:id/passphrase', async (req, res) => {
       const valid = Validator.fromRequest(req);
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index a036feeec..b7f4b1f0a 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -659,6 +659,50 @@ class Wallet extends EventEmitter {
     return account;
   }
 
+  /**
+   * Modify an account. Requires passphrase if master key is encrypted.
+   * @param {String|Number} acct
+   * @param {Object} options
+   * @param {String} [passphrase]
+   * @returns {Promise<Account>}
+   */
+
+  async modifyAccount(acct, options, passphrase) {
+    const unlock = await this.writeLock.lock();
+    try {
+      return await this._modifyAccount(acct, options, passphrase);
+    } finally {
+      unlock();
+    }
+  }
+
+  /**
+   * Create an account without a lock.
+   * @param {String|Number} acct
+   * @param {Object} options
+   * @param {String} [passphrase]
+   * @returns {Promise<Account>}
+   */
+
+  async _modifyAccount(acct, options, passphrase) {
+    if (!await this.hasAccount(acct))
+      throw new Error(`Account ${acct} does not exist.`);
+
+    await this.unlock(passphrase);
+
+    const account = await this.getAccount(acct);
+    assert(account);
+
+    const b = this.db.batch();
+
+    if (options.lookahead != null)
+      await account.setLookahead(b, options.lookahead);
+
+    await b.write();
+
+    return account;
+  }
+
   /**
    * Ensure an account. Requires passphrase if master key is encrypted.
    * @param {Object} options - See {@link Account} options.
@@ -714,7 +758,7 @@ class Wallet extends EventEmitter {
   /**
    * Retrieve an account from the database.
    * @param {Number|String} acct
-   * @returns {Promise} - Returns {@link Account}.
+   * @returns {Promise<Account>}
    */
 
   async getAccount(acct) {
@@ -4328,41 +4372,6 @@ class Wallet extends EventEmitter {
     return paths;
   }
 
-  /**
-   * Increase lookahead for account.
-   * @param {(Number|String)?} account
-   * @param {Number} lookahead
-   * @returns {Promise}
-   */
-
-  async setLookahead(acct, lookahead) {
-    const unlock = await this.writeLock.lock();
-    try {
-      return this._setLookahead(acct, lookahead);
-    } finally {
-      unlock();
-    }
-  }
-
-  /**
-   * Increase lookahead for account (without a lock).
-   * @private
-   * @param {(Number|String)?} account
-   * @param {Number} lookahead
-   * @returns {Promise}
-   */
-
-  async _setLookahead(acct, lookahead) {
-    const account = await this.getAccount(acct);
-
-    if (!account)
-      throw new Error('Account not found.');
-
-    const b = this.db.batch();
-    await account.setLookahead(b, lookahead);
-    await b.write();
-  }
-
   /**
    * Sync address depths based on a transaction's outputs.
    * This is used for deriving new addresses when
diff --git a/test/wallet-http-test.js b/test/wallet-http-test.js
index 9d542c47b..b2bd77632 100644
--- a/test/wallet-http-test.js
+++ b/test/wallet-http-test.js
@@ -124,6 +124,19 @@ describe('Wallet HTTP', function() {
     assert.strictEqual(getNewAccount.lookahead, 1001);
   });
 
+  it('should modify account lookahead to 1000', async () => {
+    const wname = 'lookahead2';
+    await wclient.createWallet(wname);
+
+    const defAccount = await wclient.getAccount(wname, 'default');
+    assert.strictEqual(defAccount.lookahead, 200);
+
+    const modified = await wclient.modifyAccount(wname, 'default', {
+      lookahead: 1000
+    });
+    assert.strictEqual(modified.lookahead, 1000);
+  });
+
   it('should get key by address from watch-only', async () => {
     const phrase = 'abandon abandon abandon abandon abandon abandon '
       + 'abandon abandon abandon abandon abandon about';