diff --git a/README.md b/README.md
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@@ -1,6 +1,6 @@
 # videojs-vtt-thumbnails
 
-Video.js plugin that displays thumbnails on progress bar hover, driven by external VTT files.  Based on the spec at: https://support.jwplayer.com/customer/portal/articles/1407439-adding-preview-thumbnails
+Video.js plugin that displays thumbnails on progress bar hover, driven by external VTT files.  Based on [this JW Player spec](https://support.jwplayer.com/customer/portal/articles/1407439-adding-preview-thumbnails). Note, this plugin currently only supports sprited thumbnails.
 
 Note: Plugin hides the default skin's mouse display timestamp on hover.