diff --git a/README.md b/README.md
index 706a3c7..c43a54f 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,6 @@ while( frame_reader.read_integer_frame(&mut buffer) > 0) {
 ## Note on Testing
 
 All of the media for the integration tests is committed to the respository
-in either zipped form or is created by ffmpeg. Before you can run tests,
-you need to `cd` into the `tests` directory and run the `create_test_media.sh`
-script.
+in either zipped form or is created by ffmpeg. Before you can run tests, you will
+need to have ffmpeg installed on your host, and you will need to `cd` into the 
+`tests` directory and run the `create_test_media.sh` script.