diff --git a/Preferences.md b/Preferences.md
new file mode 100644
index 0000000..d676db5
--- /dev/null
+++ b/Preferences.md
@@ -0,0 +1,36 @@
+Preferences for Invidious can be stored in a cookie named `PREFS`.  This cookie can be set on the Invidious Preferences page.
+
+If setting the cookie value yourself, the value must be in JSON format and then URL-encoded.
+
+These are the preferences you can set:
+
+```
+{
+   "video_loop":false, // Always loop?
+   "autoplay":false,
+   "continue":false,   // Autoplay next video
+   "listen":false,     // Audio-only mode by default?
+   "speed":1.0,        // Also accepts '0.5', '1.5', '2.0'
+   "quality":"hd720",  // Also accepts 'dash' for 1080p, 'medium', 'small'
+   "volume":100,
+   "comments":[
+      "youtube",
+      ""               // Also accepts 'reddit'
+   ],
+   "captions":[        // Language captions in order of preference?
+      "",
+      "",
+      ""
+   ],
+   "related_videos":true,
+   "redirect_feed":false,
+   "locale":"en-US",
+   "dark_mode":false,
+   "thin_mode":false,
+   "max_results":40,
+   "sort":"published",
+   "latest_only":false,
+   "unseen_only":false,
+   "notifications_only":false
+}
+```