diff --git a/final4/README.md b/final4/README.md
index 30be153..262b0cb 100644
--- a/final4/README.md
+++ b/final4/README.md
@@ -1,5 +1,7 @@
 # Final4
 
+AR = Adjust to Aspect Ratio
+
 | Res shortname | Resolution | FPS | Codec | Average bitrate | Max bitrate | Buffer size | Audio codec | Audio bitrate |
 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
 | 1080p | 1920xAR | Same as input | h264 | 6000K | 8000K | 8000K | AAC | 320K |