diff --git a/README.md b/README.md
index 8760e31..0e214c8 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,7 @@ https://hatscripts.github.io/circle-flags/flags/xx.svg
```
(Where `xx` is the [ISO 3166-1 alpha-2 code](https://www.iso.org/obp/ui/#search/code/) of a country).
-For example:
-
+For example, the following code:
```html
@@ -21,9 +20,7 @@ For example:
```
-Gives:
-
-\
+...produces this:
@@ -31,3 +28,22 @@ Gives:
+
+## Contributing
+
+To contribute, you need to have [svgo](https://github.com/svg/svgo) installed
+(version 1.2.0 or newer).
+
+First, edit the relevant SVG files in the `flags/` directory.
+
+Then run `svgo` to optimize the SVG files:
+
+```sh
+svgo ./flags --recursive
+```
+
+Then commit the changes, and submit them as a pull request.
+
+## License
+
+This project is released under the [MIT license](LICENSE).
diff --git a/compress.py b/compress.py
deleted file mode 100644
index fa257d8..0000000
--- a/compress.py
+++ /dev/null
@@ -1,18 +0,0 @@
-import shutil
-from pathlib import Path
-from subprocess import run
-
-# Compress all SVG files in a directory, recursively entering subdirectories.
-# This solution is necessary because SVGO lacks support for a '--recursive' option
-# (https://github.com/svg/svgo/pull/712), and other workarounds are platform-dependant.
-
-svgo = shutil.which("svgo") # https://stackoverflow.com/a/32799942/2203482
-
-def compress(path):
- # Calling "svgo -f " is much faster than calling "svgo " for each SVG
- run([svgo, "-f", str(path), "--config=svgo.yml"])
- for path in path.iterdir():
- if path.is_dir():
- compress(path)
-
-compress(Path("flags"))