1 files changed, 8 insertions, 0 deletions
diff --git a/README.md b/README.md
index a00ca65..c12d825 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,14 @@ make staging
 make prod
 ```
 
+## External tools
+
+Certificates are generally managed by the `acme` project. In particular,
+although this playbook does set the DANE hash based on the certificates found
+on the `acme` server, it does not directly install any itself. This is to
+prevent the playbook from overwriting already-renewed certifictes, that the
+playbook is not aware of.
+
 ## Git hooks
 
 We provide sample git hooks in the `hooks` directory. To use these, ensure the