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-rw-r--r--ansible/roles/opendkim/README.md13
1 files changed, 13 insertions, 0 deletions
diff --git a/ansible/roles/opendkim/README.md b/ansible/roles/opendkim/README.md
index 4ed31cd..2b8a22a 100644
--- a/ansible/roles/opendkim/README.md
+++ b/ansible/roles/opendkim/README.md
@@ -33,3 +33,16 @@ for.
`opendkim_selector` is the selector used for these, normally a hostname or
`default` suffices.
+
+`opendkim_extra_signings` is primarily for reuse of a DKIM key on a subdomain of
+another signed domain, for example:
+
+```yaml
+opendkim_extra_signings:
+ - domain: int.pydis.wtf
+ use_key: pydis.wtf
+```
+
+This will reuse the key for pydis.wtf on int.pydis.wtf, you will still need to
+configure the relevant DKIM keys for the subdomain (i.e. `TXT
+selector._domainkey.int.pydis.wtf_`).