diff --git a/ACKNOWLEDGMENTS.md b/ACKNOWLEDGMENTS.md
index 81b84e3..3075a8a 100644
--- a/ACKNOWLEDGMENTS.md
+++ b/ACKNOWLEDGMENTS.md
@@ -6,3 +6,5 @@ Logos and icons were provided by [freepik.com](http://www.freepik.com/) and [fla
 Contribution recognition image comes from [nuxeo.com](http://www.nuxeo.com/).
 
 Standards comic comes from [xkcd.com](https://xkcd.com/927/).
+
+Wallpaper author is unknown.
diff --git a/wallpapers/chameleon-green-lizard-hd-wallpaper1.jpg b/wallpapers/chameleon-green-lizard-hd-wallpaper1.jpg
new file mode 100644
index 0000000..ede1637
Binary files /dev/null and b/wallpapers/chameleon-green-lizard-hd-wallpaper1.jpg differ