diff --git a/README.md b/README.md
index 008f21c..3763885 100644
--- a/README.md
+++ b/README.md
@@ -32,5 +32,14 @@ Now, you can run the script. The input dir should be bind mounted read-only, and
 podman run --rm \
 --mount="type=bind,src=$INPUT_DIR,dst=/media,ro" \
 --mount="type=bind,src=$OUTPUT_DIR,dst=/output" \
-localhost/[local-image-name] -- /media
+localhost/[local-image-name] -- /media/path/to/video.mp4
 ```
+
+The `/media` destination folder for the input dir is arbitrary. You can use any folder you like, as long as the file you pass as the execution argument is located within that folder.
+
+# Remote dependencies
+
+The container fetches the following remote resources at build time.
+- Debian (Stretch) container iage from `docker.io/library`.
+- biftools_linux.zip file from `rokudev/samples` repository.
+- `ffmpeg` and `unzip` packages, the former of which contains deprecated library `libavformat.so.57`, from `archive.debian.org`.