diff --git a/site/_docs/datafiles.md b/site/_docs/datafiles.md
index a8dd3bce..e333bdb9 100644
--- a/site/_docs/datafiles.md
+++ b/site/_docs/datafiles.md
@@ -10,8 +10,9 @@ In addition to the [built-in variables](../variables/) available from Jekyll,
 you can specify your own custom data that can be accessed via the [Liquid
 templating system](https://wiki.github.com/shopify/liquid/liquid-for-designers).
 
-Jekyll supports loading data from [YAML](http://yaml.org/) and [JSON](http://www.json.org/) files located in the
-`_data` directory.
+Jekyll supports loading data from [YAML](http://yaml.org/), [JSON](http://www.json.org/),
+and [CSV](https://en.wikipedia.org/wiki/Comma-separated_values) files located in the `_data` directory.
+Note that CSV files *must* contain a header row.
 
 This powerful feature allows you to avoid repetition in your templates and to
 set site specific options without changing `_config.yml`.