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diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 0598eccc8..5324be398 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -38273,6 +38273,7 @@ These options take (expandable) strings as arguments.
MANDATORY:
The domain you want to sign with. The result of this expanded
option is put into the &%$dkim_domain%& expansion variable.
+If it is empty after expansion, DKIM signing is not done.
.option dkim_selector smtp string&!! unset
MANDATORY: