diff --git a/README.md b/README.md
index b62dd43..46dff37 100644
--- a/README.md
+++ b/README.md
@@ -153,3 +153,23 @@ The following options can be set for any particular page. While the default opti
   * `name` - If the name of the thing that the page represents is different from the page title. (i.e.: "Frank's Café" vs "Welcome to Frank's Café")
   * `type` - The type of things that the page represents. This must be a [Schema.org type](http://schema.org/docs/schemas.html), and will probably usually be something like [`BlogPosting`](http://schema.org/BlogPosting), [`NewsArticle`](http://schema.org/NewsArticle), [`Person`](http://schema.org/Person), [`Organization`](http://schema.org/Organization), etc.
   * `links` - An array of other URLs that represent the same thing that this page represents. For instance, Jane's bio page might include links to Jane's GitHub and Twitter profiles.
+
+### Customizing image output
+
+For most users, setting `image: [path-to-image]` on a per-page basis should be enough. If you need more control over how images are represented, the `image` property can also be an object, with the following options:
+
+* `path` - The relative path to the image. Same as `image: [path-to-image]`
+* `twitter` - The relative path to a Twitter-specific image.
+* `facebook` - The relative path to a Facebook-specific image.
+* `height` - The height of the Facebook (`og:image`) image
+* `width` - The width of the Facebook (`og:image`) image
+
+You can use any of the above, optional properties, like so:
+
+```yml
+image:
+  twitter: /img/twitter.png
+  facebook: /img/facebook.png
+  height: 100
+  width: 100
+```