diff --git a/flatten-promise/README.md b/flatten-promise/README.md
deleted file mode 100644
index f7f1459..0000000
--- a/flatten-promise/README.md
+++ /dev/null
@@ -1,16 +0,0 @@
-Here's the basic usage of the file that you'll be creating:
-
-```js
-var flattenPromise = require('./') // <- this is the file you make;
-
-var p1 = new Promise(function(resovle) { resovle('done'); });
-var p2 = new Promise(function(resovle) { resovle(p1); });
-var p3 = new Promise(function(resovle) { resovle(p2); });
-var p4 = new Promise(function(resovle) { resovle(p3); });
-
-flattenPromise(p4).then(function(result) {
-  console.log(result); // 'done'
-});
-```
-
-More info: http://www.html5rocks.com/en/tutorials/es6/promises/
diff --git a/flatten-promise/test.js b/flatten-promise/test.js
deleted file mode 100644
index 96961b3..0000000
--- a/flatten-promise/test.js
+++ /dev/null
@@ -1,19 +0,0 @@
-var assert = require('assert');
-var flattenPromise = require('./');
-
-describe('flattenPromise', function() {
-
-  it('flattens the promises', function(done) {
-    var p1 = new Promise(function(resovle) { resovle('done'); });
-    var p2 = new Promise(function(resovle) { resovle(p1); });
-    var p3 = new Promise(function(resovle) { resovle(p2); });
-    var p4 = new Promise(function(resovle) { resovle(p3); });
-
-    flattenPromise(p4).then(function(result) {
-      assert.equal(result, 'done');
-      done();
-    });
-  });
-
-
-});
diff --git a/flatten-thunk/README.md b/flatten-thunk/README.md
new file mode 100644
index 0000000..8bc31f4
--- /dev/null
+++ b/flatten-thunk/README.md
@@ -0,0 +1,43 @@
+Here's the basic usage of the file that you'll be creating:
+
+```js
+var flattenThunk = require('./') // <- this is the file you make;
+
+var thunk1 = function(cb) {
+  setTimeout(function() {
+    cb(null, 'done');
+  }, 1);
+}
+var thunk2 = function(cb) {
+  setTimeout(function() {
+    cb(null, thunk1);
+  }, 1);
+}
+var thunk3 = function(cb) {
+  setTimeout(function() {
+    cb(null, thunk2);
+  }, 1);
+}
+
+flattenThunk(thunk3)(function(err, result) {
+  console.log(result); // 'done'
+});
+```
+
+A thunk is basically a function that you call with just the callback as a parameter:
+
+```js
+
+// this is a regular node CPS function
+fs.readFile('package.json', function(err, result) {
+  console.log(result);
+});
+
+// this is a thunk
+var readFileThunk = fs.readFileThunkily('package.json');
+readFileThunk(function(err, result) {
+  console.log(result);
+});
+```
+
+More info: https://github.com/tj/node-thunkify
diff --git a/flatten-promise/package.json b/flatten-thunk/package.json
similarity index 100%
rename from flatten-promise/package.json
rename to flatten-thunk/package.json
diff --git a/flatten-thunk/test.js b/flatten-thunk/test.js
new file mode 100644
index 0000000..df7d1c5
--- /dev/null
+++ b/flatten-thunk/test.js
@@ -0,0 +1,31 @@
+var assert = require('assert');
+var flattenThunk = require('./');
+
+describe('flattenThunk', function() {
+
+  it('flattens the promises', function(done) {
+
+    var thunk1 = function(cb) {
+      setTimeout(function() {
+        cb(null, 'done');
+      }, 1);
+    }
+    var thunk2 = function(cb) {
+      setTimeout(function() {
+        cb(null, thunk1);
+      }, 1);
+    }
+    var thunk3 = function(cb) {
+      setTimeout(function() {
+        cb(null, thunk2);
+      }, 1);
+    }
+
+    flattenThunk(thunk3)(function(err, result) {
+      assert.equal(result, 'done');
+      done();
+    });
+  });
+
+
+});