docs: add colophon to subplot

1 files changed, 9 insertions, 0 deletions

diff --git a/jt.md b/jt.md
index dcd3c51..cbea089 100644
--- a/jt.md
+++ b/jt.md
@@ -175,6 +175,15 @@ set -eux
 echo "Open sesame!" >> "$1"
 ~~~
 
+
+# Colophon
+
+This document is meant to be processed with the [Subplot][] program to
+typeset into HTML or PDF or to generate a program that automatically
+verifies that all acceptance criteria are met.
+
+[Subplot]: https://subplot.liw.fi/
+
 ---
 title: "jt—a journalling tool"
 author: