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diff --git a/posts/SDL2_devlog.md b/posts/SDL2_devlog.md
index 72aedef..991a246 100644
--- a/posts/SDL2_devlog.md
+++ b/posts/SDL2_devlog.md
@@ -29,6 +29,11 @@ Some aliases to switch between brushes:
     (else (brush-circle))))
 ```
 
+The following script draws a straight line along a given
+axis, at a given distance from the canvas boundary:
+
+![Day 16](https://u.peppe.rs/b3i.mp4)
+
 ### Day 15
 
 I began writing a standard library for the lisp, in lisp. It