added warning about possible behaviour-change with new domains.txt.d feature

diff --git a/docs/domains_txt.md b/docs/domains_txt.md
index e0c7e0bfe0fe16a1dffbd54b3bac54d49e665b14..dcdbe4179c02739fe1ffef34333f280240ae063c 100644 (file)
--- a/docs/domains_txt.md
+++ b/docs/domains_txt.md
@@ -101,3 +101,7 @@ If a directory named `domains.txt.d` exists in the same location as
 `domains.txt`, the contents of `*.txt` files in that directory are appended to
 the list of domains, in alphabetical order of the filenames. This is useful for
 automation, as it doesn't require editing an existing file to add new domains.
+
+Warning: Behaviour of this might change as the naming between `domains.txt.d`
+and the `DOMAINS_D` config variable (which is used for per-certificate
+configuration) is a bit confusing.