X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/142622b3f385bfcc36eae176763a7225c2e49b3c..87cb4a166c47b57df48c2918e47801d77639fbb0:/doc/doc-docbook/spec.xfpt

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: