diff --git a/README.md b/README.md
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+---
+configs:
+- config_name: all
+  default: true
+  data_files: data/*/*/*.parquet
+- config_name: wallstreetbets
+  data_files: data/wallstreetbets/*/*.parquet
+- config_name: singularity
+  data_files: data/singularity/*/*.parquet
+- config_name: artificial
+  data_files: data/artificial/*/*.parquet
+- config_name: LocalLLaMA
+  data_files: data/LocalLLaMA/*/*.parquet
+---
+
+# Text-only subreddit submissions
+
+All submissions from 4 subreddits, extracted from the Arctic Shift Reddit dumps
+in [`open-index/arctic`](https://huggingface.co/datasets/open-index/arctic). Used for the CSC422 project
+"Predicting Social Media Post Success".
+
+Subreddits: wallstreetbets, singularity, artificial, LocalLLaMA.
+
+Layout: `data/<subreddit>/<YYYY>/<MM>.parquet`, rows sorted by `created_utc`. Columns are unchanged from the
+source. NSFW posts (`over_18`) and deleted/removed posts are excluded: author `[deleted]`, selftext `[deleted]` or
+`[removed]`, title `[deleted by user]` or `[ Removed by moderator ]`, or a moderator flair that marks the post
+removed ("Removed", "Rule 2 – Removed", "User Deleted", "Spam"). `score` and `num_comments` are the
+values at archival time.
+
+The source has no submissions for 2022-09 through 2023-11, so this dataset has the same gap.
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