diff --git a/API.md b/API.md
index 26f2481..86a88e3 100644
--- a/API.md
+++ b/API.md
@@ -107,6 +107,12 @@
 }
 ```
 
+Parameters:
+
+```
+region: [ISO 3166](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Decoding_table) (default: "US")
+```
+
 ##### GET `/api/v1/comments/:id`
 
 > Schema:
@@ -150,6 +156,7 @@
 Parameters:
 
 ```
+source: "youtube", "reddit"
 continuation: String
 ```
 
@@ -195,6 +202,7 @@ Parameters:
 label: String
 lang:  String
 tlang: String
+region: [ISO 3166](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Decoding_table) (default: "US")
 ```
 
 A request with `label` will return the selected captions in WebVTT format.
@@ -236,6 +244,13 @@ Captions can also be selected with an ISO `lang`, e.g. &lang=en, `tlang` will au
 ]
 ```
 
+Parameters:
+
+```
+type: "music", "gaming", "news", "movies"
+region: [ISO 3166](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Decoding_table) (default: "US")
+```
+
 ##### GET `/api/v1/top`
 
 > Schema:
@@ -629,6 +644,7 @@ date: "hour", "today", "week", "month", "year"
 duration: "short", "long"
 type: "video", "playlist", "channel", "all", (default: video)
 features: "hd", "subtitles", "creative_commons", "3d", "live", "purchased", "4k", "360", "location", "hdr" (comma separated: e.g. "&features=hd,subtitles,3d,live")
+region: [ISO 3166](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Decoding_table) (default: "US")
 ```
 
 ##### GET `/api/v1/playlists/:plid`