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 # Description
 
 This module is an alternative [Airflow](https://github.com/apache/airflow) XCom backend.
+
+# Details
+
+Airflow [XCom](https://airflow.apache.org/docs/apache-airflow/stable/concepts.html#xcoms) is a way Tasks exchange values in a DAG. By default the values are stored in the default Airflow database. This makes it unsuitable for sharing large volumes of data for two reasons:
+
+* PostgreSQL has a limit of 1GB per XCom value
+* Using the same database as other Airflow data may degrade performance
+
+For these reasons Airflow [allows for implementing a custom XCom backend](https://airflow.apache.org/docs/apache-airflow/stable/concepts.html#custom-xcom-backend). This module is one such implementation for use with Redis.
+
+# Requirements
+
+Currently the module uses the [Python Redis module](https://pypi.org/project/redis/) which is already provided by Airflow.
+
+The only requirements is for Airflow to have a Redis [Connection](https://airflow.apache.org/docs/apache-airflow/stable/concepts.html#connections) defined called `xcom_cache`.
+
+# TODO
+
+Possible future improvements:
+
+* Get Connection ID from configuration or environment variables
+* Splitting of values into different keys to avoid size limits