diff --git a/src/api.js b/src/api.js
index be160f5..874ef9c 100644
--- a/src/api.js
+++ b/src/api.js
@@ -10,7 +10,7 @@ import createDebug from 'debug';
 
 const debug = createDebug('squirrel');
 
-const createAPI = store => {
+const createAPI = (store, client, options = {cwd: '/'}) => {
   const getBy = (index, key) => {
     debug(`getBy: ${index} => ${key}`);
     return store('indexes').then(getOr(null, [index, key, 'value']));
@@ -28,6 +28,12 @@ const createAPI = store => {
     return store('node').then(_get(path));
   };
 
+  const set = (_path, value) => {
+    _path = path.join(options.cwd, _path);
+    debug(`set => ${_path}`);
+    return _set(_path, value);
+  };
+
   const _get = curry((_path, node) => {
     if (!node) return null;
     if (path.relative(node.key, _path) === '') return node;
@@ -37,10 +43,26 @@ const createAPI = store => {
     }, node.nodes));
   });
 
+  const _set = (_path, value) => {
+    return new Promise(function(resolve, reject) {
+      if (!value) {
+        return resolve(value);
+      }
+      client.set(_path, value, (err, res) => {
+        if (err) {
+          return reject(err);
+        }
+
+        return resolve(res);
+      });
+    });
+  };
+
   return {
     getBy,
     getAll,
-    get
+    get,
+    set
   };
 };
 
diff --git a/src/index.js b/src/index.js
index 19a32a1..bff63e6 100644
--- a/src/index.js
+++ b/src/index.js
@@ -46,7 +46,7 @@ const createSquirrel = options => {
     save(node$),
     indexBuilder
   );
-  const api = createAPI(store);
+  const api = createAPI(store, client, options);
 
   return {
     ...api,
diff --git a/src/test/api.js b/src/test/api.js
index fa07e6a..44fdab1 100644
--- a/src/test/api.js
+++ b/src/test/api.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 
 import createAPI from '../api';
-
+import Etcd from './fixtures/node-etcd';
 const node = {
   key: '/',
   dir: true,
@@ -85,13 +85,17 @@ const store = {
 };
 
 const getStore = key => Promise.resolve(store[key]);
-const api = createAPI(getStore);
+const client = new Etcd();
+const api = createAPI(getStore, client);
+const clientErrored = new Etcd({err: new Error('boom')});
+const apiErrored = createAPI(getStore, clientErrored);
 
 test('should create API', t => {
   t.truthy(api);
   t.truthy(api.get);
   t.truthy(api.getBy);
   t.truthy(api.getAll);
+  t.truthy(api.set);
 });
 
 test('should get keys of simple index', async t => {
@@ -174,3 +178,24 @@ test('should get null if any node matches this path', async t => {
     null
   );
 });
+
+test('should set nothing if value is null', async t => {
+  t.deepEqual(
+    await api.set('/nope', null),
+    null
+  );
+});
+
+test('should set value if value setted', async t => {
+  t.deepEqual(
+    await api.set('/foo', {foo: 'baz'}),
+    {foo: 'baz'}
+  );
+});
+
+test('should failed if error occured', async t => {
+  t.throws(
+    apiErrored.set('/foo', {foo: 'baz'}),
+    /boom/
+  );
+});
diff --git a/src/test/fixtures/node-etcd.js b/src/test/fixtures/node-etcd.js
new file mode 100644
index 0000000..43c3a14
--- /dev/null
+++ b/src/test/fixtures/node-etcd.js
@@ -0,0 +1,14 @@
+'use strict';
+
+function Etcd(options = {}) {
+  this.options = options;
+}
+
+Etcd.prototype.set = function set(path, value, callback) {
+  if (this.options.err) {
+    return callback(this.options.err);
+  }
+  callback(null, value);
+};
+
+module.exports = Etcd;