diff --git a/lib/zenhub.js b/lib/zenhub.js
index 74be874..62a2253 100644
--- a/lib/zenhub.js
+++ b/lib/zenhub.js
@@ -25,7 +25,7 @@ module.exports = ZenHub;
  * @param object    parameters      additional parameters
  * @callback        complete
  * @memberof        ZenHub
- * @method          get
+ * @method          _get
  */
 ZenHub.prototype._get = function(url, parameters, callback) {
     parameters = extend(parameters, this.credentials); // Add credentials to parameters
@@ -52,7 +52,7 @@ ZenHub.prototype._get = function(url, parameters, callback) {
  * @param object    body            request body
  * @callback        complete
  * @memberof        ZenHub
- * @method          get
+ * @method          _post
  */
 ZenHub.prototype._post = function(url, parameters, body, callback) {
     parameters = extend(parameters, this.credentials); // Add credentials to parameters
@@ -68,6 +68,31 @@ ZenHub.prototype._post = function(url, parameters, body, callback) {
     });
 };
 
+/**
+ * Helper to handle PUT requests to the API with authorization
+ *
+ * @private
+ * @param string    url             address part after API root
+ * @param object    parameters      additional parameters
+ * @param object    body            request body
+ * @callback        complete
+ * @memberof        ZenHub
+ * @method          _put
+ */
+ZenHub.prototype._put = function(url, parameters, body, callback) {
+    parameters = extend(parameters, this.credentials); // Add credentials to parameters
+    var putURL = API_URL + '/' + url + '?' + querystring.stringify(parameters); // Construct URL with parameters
+
+    request.put({
+        url: putURL,
+        strictSSL: true,
+        json: true,
+        body: body,
+    }, function(error, response, body) {
+        callback(error, body || {});
+    });
+};
+
 /**
  * Show All Pipelines in a repo board
  * This method returns all pipelines in a repo board
@@ -172,3 +197,19 @@ ZenHub.prototype.convertIssueToEpic = function (repoId, issueId, payload, callba
         callback(error, body);
     });
 };
+
+/**
+ * Set estimate in issue
+ * This method set estimate for an issue on ZenHub.
+ * @param int   repoId      github id of repository
+ * @param int   issueId      github id of issue to convert
+ * @param object    payload      contains estimate to set for the issue, see https://github.com/ZenHubIO/API#set-estimate-for-issue for payload format
+ * @callback    complete
+ * @memberof    ZenHub
+ * @method      setEstimateForIssue
+ */
+ZenHub.prototype.setEstimateForIssue = function (repoId, issueId, payload, callback) {
+    this._put('repositories/' + repoId + '/issues/' + issueId + '/estimate', {}, payload, function (error, body) {
+        callback(error, body);
+    });
+};
diff --git a/test/zenhubWriteTest.js b/test/zenhubWriteTest.js
index 6dfbc30..0d7e86d 100644
--- a/test/zenhubWriteTest.js
+++ b/test/zenhubWriteTest.js
@@ -64,4 +64,19 @@ describe('ZenHub Write API', function() {
             api.convertIssueToEpic(repoId, issueId, payload, done);
        });
     });
+
+    describe('Set estimate for issue test', function() {
+        var issueId = 457;
+
+        it('should send payload to the ZenHub API', function(done) {
+            var payload = {
+                estimate: 8
+            };
+            nock('https://api.zenhub.io/p1')
+                .put('/repositories/' + repoId + '/issues/' + issueId + '/estimate' + tokenQueryString, payload)
+                .reply(200, { status: 'OK' });
+            api.setEstimateForIssue(repoId, issueId, payload, done);
+       });
+    });
+
 });