diff --git a/docs/api.md b/docs/api.md
index 8cefabe8..bbd378d3 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -431,6 +431,7 @@ Overlay (composite) a image containing an alpha channel over the processed (resi
 `options`, if present, is an Object with the following optional attributes:
 
 * `gravity` is a String or an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north` at which to place the overlay, defaulting to `center`/`centre`.
+* `tile` is a Boolean, defaulting to `false`. When set to `true` repeats the overlay image across the entire image with the given `gravity`.
 
 ```javascript
 sharp('input.png')
diff --git a/docs/changelog.md b/docs/changelog.md
index c996f174..f9957f75 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -10,6 +10,14 @@ Requires libvips v8.3.1
   [#429](https://github.com/lovell/sharp/issues/429)
   [@papandreou](https://github.com/papandreou)
 
+* Add alpha channel, if required, before extend operation.
+  [#439](https://github.com/lovell/sharp/pull/439)
+  [@frulo](https://github.com/frulo)
+
+* Allow overlay image to be repeated across entire image via tile option.
+  [#443](https://github.com/lovell/sharp/pull/443)
+  [@lemnisk8](https://github.com/lemnisk8)
+
 #### v0.15.0 - 21<sup>st</sup> May 2016
 
 * Use libvips' new Lanczos 3 kernel as default for image reduction.
diff --git a/docs/index.md b/docs/index.md
index 3e5a0a0c..f6e6855a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -92,6 +92,8 @@ the help and code contributions of the following people:
 * [Kenton Gray](https://github.com/kentongray)
 * [Felix Bünemann](https://github.com/felixbuenemann)
 * [Samy Al Zahrani](https://github.com/salzhrani)
+* [Chintan Thakkar](https://github.com/lemnisk8)
+* [F. Orlando Galashan](https://github.com/frulo)
 
 Thank you!
 
diff --git a/package.json b/package.json
index f10bcda3..0b83f592 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sharp",
-  "version": "0.15.0",
+  "version": "0.15.1",
   "author": "Lovell Fuller <npm@lovell.info>",
   "contributors": [
     "Pierre Inglebert <pierre.inglebert@gmail.com>",
@@ -22,7 +22,9 @@
     "John Tobin <john@limelightmobileinc.com>",
     "Kenton Gray <kentongray@gmail.com>",
     "Felix Bünemann <Felix.Buenemann@gmail.com>",
-    "Samy Al Zahrani <samyalzahrany@gmail.com>"
+    "Samy Al Zahrani <samyalzahrany@gmail.com>",
+    "Chintan Thakkar <lemnisk8@gmail.com>",
+    "F. Orlando Galashan <frulo@gmx.de>"
   ],
   "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
   "scripts": {
@@ -68,7 +70,7 @@
     "exif-reader": "^1.0.0",
     "icc": "^0.0.2",
     "istanbul": "^0.4.3",
-    "mocha": "^2.4.5",
+    "mocha": "^2.5.3",
     "mocha-jshint": "^2.3.1",
     "node-cpplint": "^0.4.0",
     "rimraf": "^2.5.2",