diff --git a/images/metaball_demo.gif b/images/metaball_demo.gif
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diff --git a/images/metaball_demo.png b/images/metaball_demo.png
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diff --git a/isosurface.scad b/isosurface.scad
index e0b3af77..6f3771ca 100644
--- a/isosurface.scad
+++ b/isosurface.scad
@@ -1217,7 +1217,7 @@ function mb_torus(r_maj, r_min, cutoff=INF, influence=1, negative=false, d_maj,
 // Usage: As a function
 //   vnf = metaballs(spec, voxel_size, bounding_box, [isovalue=], [closed=], [convexity=], [show_stats=]);
 // Description:
-//   ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo.png)
+//   ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo.gif)
 //   .
 //   [Metaballs](https://en.wikipedia.org/wiki/Metaballs), also known as "blobby objects",
 //   can produce smoothly varying blobs and organic forms. You create metaballs by placing metaball