diff --git a/README.md b/README.md
index d88ee0fb1..ef575ec89 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,13 @@
3. Install dependencies:
```pip install -r requirements.txt```
It may be necessary in some cases to separately install the SDL libraries.
-4. Run:
+4. Install ffmpeg on Windows, Mac and Linux
+
Windows installer found here
+
Mac instructions
+
```brew install ffmpeg -y```
+
Debian based instructions
+
```sudo apt-get install ffmpeg -y```
+5. Run:
```python run_pretrained_interactive.py```
By default the game with terminate after 32K steps, or ~1 hour. You can increase this by adjusting the `ep_length` variable, but it will also use more memory.