diff --git a/dev/readme.md b/dev/readme.md
index 07cc1a9..9145a69 100644
--- a/dev/readme.md
+++ b/dev/readme.md
@@ -1,2 +1,8 @@
-Set env var GANDI_API_KEY to your GANDI LiveDNS API key and run ./dev_shell.sh
-to get a shell with certbot ready to run with the plugin installed.
+# Testing/Development
+
+Set env var `GANDI_API_KEY` to your Gandi LiveDNS API key and
+run `./dev_shell.sh` to get a shell with `certbot` available and the plugin
+installed.
+
+The plugin is installed in "edit" mode, so changes to the source will be
+effective immediately without any deployment step.