diff --git a/README.md b/README.md
index ef951d2..73e9d31 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,25 @@ Copy the configuration file, make any necessary changes, and run:
   again
 * `delay`: time to wait after processing all rules before running the loop
   again
+
+## Database Schema
+
+`adsms` uses a SQLite database to store subscriptions and information about tracked aircraft. Currently, the only table is `subscriptions`.
+
+### `subscriptions`
+
+The `subscriptions` table has the following columns:
+
+| Column Name   | Data Type | Description                                                    |
+| ------------- | --------- | -------------------------------------------------------------- |
+| `rowid`       | INTEGER   | Unique identifier for the subscription.                        |
+| `phone`       | TEXT      | Phone number to receive notifications for this subscription.   |
+| `icao`        | TEXT      | ICAO address of the aircraft to track.                          |
+| `description` | TEXT      | Description of the aircraft being tracked.                     |
+| `last_seen`   | INTEGER   | Timestamp of the last time this aircraft was seen by the system.|
+
+This table stores information about each subscription, including the phone number to send notifications to, the ICAO address of the aircraft to track, a description of the aircraft, and the last time it was seen by the system.
+
+## Use of ChatGPT 
+
+Portions of both this README and the `adsms` code have been partially written with ChatGPT.
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