diff --git a/README.md b/README.md
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@@ -2,3 +2,27 @@ netflix-rater
 =============
 
 Very simple Chrome extension that "imports" a large number of movie ratings into a Netflix profile by automatically clicking on stars.
+
+**It is not my fault if you somehow destroy your Netflix account.**
+
+Usage
+-----
+
+This was a one-off project, so there's no real interface. This assumes you have a bunch of movie ratings in the JSON format described below.
+
+1. Download the extension code in the netflix-rater subdirectory
+2. Drop your input into that subdirectory as a file called `netflix.json`
+3. In Chrome, go to Tools > Extensions or chrome://extensions and enable Developer Mode if you haven't already
+4. Click "Load unpacked extension..." and select the netflix-rater subdirectory
+5. Log into Netflix and make sure the **correct** profile is selected under your account
+6. Click the Netflix Rater button in the toolbar
+7. Wait
+
+The extension submits one rating every five seconds to avoid getting kicked out of Netflix. You will see a large number of tabs opening and closing. It took about two hours to import my 1400 ratings from my old account. After it's all done, you can delete the extension.
+
+Input
+-----
+
+The input is a simple JSON list of objects, with each object containing at least a `"url"` key containing a string URL that points to a movie on Netflix and a `"rating"` key containing an integer rating from 0 to 5, inclusive. 0 indicates "Not Interested".
+
+An example input file is checked in under `example.json`. This input format was the output from [this GreaseMonkey export script](http://userscripts.org/scripts/show/138133) on my old Netflix account.