diff --git a/README.md b/README.md
index 42ccb92..d1eb6ed 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,6 @@ make
 This will generate a series of frames zooming into the fractal (default is 50),
 and link them together into a video. May take a while to run, depending on your
 CPU (takes about 30s on an i9-12900K with 24 threads). The video is saved as
-`output.mp4`, and the frames can be viewed directly in `imgs/`.
+`output.gif`, and the frames can be viewed directly in `imgs/`.
 
 ![h.png](h.png)