Update README

README.md

@@ -7,4 +7,42 @@ language:
 tags:
 - sports
 - travel
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+---
+
+# AI21 Hotels and WorldCup dataset cards
+
+The **AI21-Hotels** and **AI21-WorldCup** datasets were created to support research on *aggregative question answering* in open-book settings.
+Aggregative questions require retrieving information from a large set of documents and applying reasoning over the collected text snippets.
+For example, the question “What is the fewest number of total goals scored in any single World Cup?” cannot usually be answered by a single passage.
+Instead, one must gather the goals scored in each tournament and then reason to identify the minimum.
+These datasets were first introduced in the paper “Structured RAG for Answering Aggregative Questions,” which describes their design and construction in detail.
+
+## AI21-Hotels dataset
+
+The **AI21-Hotels** dataset was automatically generated, with booking-like hotel pages, paired with aggregative queries.
+The train set (in folder ai21-Hotels-train) includes 50 pages, and 138 queries.
+The evaluation set (in folder ai21-Hotels-eval) includes 350 pages, and 193 queries.
+
+## AI21-WorldCup dataset
+The **AI21-WorldCup** dataset consists of 22 Wikipedia pages, each corresponding to one WorldCup tournament held between 1930 and 2022,
+and 88 automatically generated aggregative queries. 
+To increase the difficulty, the main statistics table was removed from each document.
+Because there are only 22 tournaments in total, the dataset is provided as a single collection without separate training and evaluation splits.
+
+
+| Dataset  | Split | # Docs | # Queries | Avg. Tokens / Doc |
+| -------- |-------| ------ | --------- |-------------------|
+| Hotels   | Train | 50     | 138       | 592               |
+| Hotels   | Eval  | 350    | 193       | 596               |
+| WorldCup | ---   | 22     | 88        | 18881             |
+
+
+## Languages
+English
+
+
+## License
+Datasets are released under the MIT license.
+
+## Citation
+