diff --git a/app.yaml b/app.yaml
index e1f1953..dec6fdf 100644
--- a/app.yaml
+++ b/app.yaml
@@ -1,3 +1,6 @@
+# At one point I was deploying this using Google App Engine.
+# Then I discovered it would be cheaper to use my tiny cloud VM.
+
 runtime: go112
 
 instance_class: B1