diff --git a/docker/.gitignore b/docker/.gitignore
index fc47942..9fd418d 100644
--- a/docker/.gitignore
+++ b/docker/.gitignore
@@ -8,3 +8,9 @@ data/
 /sample/
 /md/
 /old_film.png
+
+# The NAS image bundle: 120 MB a build, and a binary every commit before this
+# line carried its own copy — which is what made the repository thirteen
+# gigabytes. It is built where it is loaded, and the checksum beside it is the
+# only part worth keeping in the history.
+/recipescam-images.tar.gz