diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..f8c6ef4
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,20 @@
+# Contributing
+
+If you want to contribute to `bld` or customize it, all you have to do is clone the GitHub
+repository and update the [RIFE2/core](https://github.com/rife2/rife2-core) submodule:
+
+```console
+git clone git@github.com:rife2/bld.git
+cd bld
+git submodule init
+git submodule update
+```
+
+Then use `bld` to build itself:
+
+```console
+./bld compile
+```
+
+The project has an IntelliJ IDEA project structure. You can just open it after all
+the dependencies were downloaded and peruse the code.