diff --git a/README.md b/README.md
index 376305a2..262340bb 100644
--- a/README.md
+++ b/README.md
@@ -118,9 +118,13 @@ To install other needed packages like cmake, we recommend first installing Homeb
 After installation of Homebrew, install cmake and ffmpeg by:
 
 ```bash
-brew install cmake ffmpeg
+brew install cmake ffmpeg@4
 # note: make sure you have cmake 3.8 or later, you can install from cmake official website if it's too old
 ```
+Link to ffmpeg@4 if there are other versions installed
+```bash
+brew link ffmpeg@4
+```
 
 Clone the repo recursively(important)