diff --git a/README.md b/README.md
index 8246746..f326eb7 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,10 @@ From [blog post](https://dev.to/nabbisen/ffmpeg-convert-video-to-gif-7h8). [Orig
 
 ```shell
 START="01:13:22"
-AMOUNT="8"
+SECONDS="8"
 FPS=10
-ffmpeg -ss $START -t $AMOUNT -i input.mp4 -r $FPS output.gif
+INFILE="input.mp4"
+OUTFILE="output.gif"
+ffmpeg -ss $START -t $SECONDS -i "${INFILE}" -r $FPS "${OUTFILE}"
 ```