diff --git a/README.md b/README.md
index c66caab..222dc00 100644
--- a/README.md
+++ b/README.md
@@ -69,8 +69,19 @@ cargo build --release
 ```
 
 This produces the binary in _release mode_ (`--release`) at
-`target/release/asciinema`. There are no other build artifacts so you can just
-copy the binary to a directory in your `$PATH`.
+`target/release/asciinema`. You can just copy the binary to a directory in your
+`$PATH`.
+
+To generate man page and shell completion files, set `ASCIINEMA_GEN_DIR` to the
+path where these artifacts should be stored. For example:
+
+```sh
+ASCIINEMA_GEN_DIR=/foo/bar cargo build --release
+```
+
+The above command will build the binary and place the man page in
+`/foo/bar/man/asciinema.1`, and the shell completion files in the
+`/foo/bar/completion/` directory.
 
 > [!NOTE]
 > Windows is currently not supported. _(See [#467](https://github.com/asciinema/asciinema/issues/467))_