diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 54d6cfb..8c5e281 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -40,3 +40,22 @@ For example:
 > `;; SPDX-FileCopyrightText: 2022 Joe Bloggs <joe@example.com>`
 
 If the copyright to your contributions is held by your employer, put your employer's name in brackets after your own name.
+
+## Build system
+
+### Building a POM file
+
+The POM file lists the dependencies needed to run `matchbot` as well as some additional information that can help people learn more about `matchbot`.
+To generate a POM file, run `clojure -T:build pom`; you should find the generated `POM.xml` file in the `target/` directory.
+
+### Building a JAR file
+
+A JAR file contains all the source code of `matchbot` in a form that the JVM can load and pass to the Clojure compiler to run.
+To generate a JAR file, run `clojure -T:build jar`; again, you should find the JAR file called something like `matchbot-x.x.x.jar` in the `target/` directory.
+
+### Building an uberjar
+
+An uberjar is much like a normal JAR file, but comes with all the dependencies of `matchbot` bundled in it.
+This means that it can run directly on the JVM without Clojure being installed (it contains a copy of the Clojure compiler itself).
+To generate an uberjar, run `clojure -T:build uber`; you should find the uberjar called something like `matchbot-x.x.x-standalone.jar` in the `target/` directory.
+Please note that if you distribute an uberjar, you must not only comply with the licence of `matchbot`, but also the licences of all `matchbot`'s dependencies, both transitive and intransitive.