diff --git a/README.md b/README.md
index 14a44c8..a7bc36b 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,19 @@ Supported `env`:
 - `FEED_URL`: Required. The url of the RSS/Atom feed.
 - `FEED_TITLE`: Override the feed `<title>`. Item titles are in the format "[feed title]: [item title]".
 
+## intake-reddit
+
+A feed source that fetches posts from a subreddit.
+
+Supported `env`:
+
+- `SUBREDDIT_NAME`: Required. The subreddit name with no `r/` prefix.
+- `SUBREDDIT_PAGE`: The listing page to fetch posts from. Defaults to `hot`. Listings that support multiple time ranges can specify as e.g. `top_week`.
+- `REQUEST_RETRY`: Attempt count for fetching posts. Retries are done with exponential backoff.
+- `FILTER_NSFW`: By default, NSFW posts are included. Set to a truthy value to skip them.
+- `TAG_NSFW`: By default, NSFW posts are tagged `nsfw`. Set to an empty string to suppress this.
+- `FILTER_SPOILER`: As `FILTER_NSFW` for posts marked as spoilers.
+- `TAG_SPOILER`: As `TAG_NSFW` for posts marked as spoilers.
+- `MIN_SCORE`: Skip posts with scores below this number.
+- `TAGS`: Comma-separated list of tags to add to all items.
+- `AUTHOR_BLOCKLIST`: Comma-separated list of usernames. Posts by these users will be skipped.