diff --git a/README.md b/README.md
index 12bde10..2a2143c 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,9 @@ This is currently a work-in-progress!
 ## 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
-will need to have ffmpeg installed, and you need to `cd` into the `tests` 
-directory and run the `create_test_media.sh` script.
+in zipped form. Before you can run tests, you need to `cd` into the `tests` 
+directory and run the `create_test_media.sh` script. Note that one of the 
+test files (the RF64 test case) is over four gigs in size.
 
 ## Resources