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diff --git a/doc/man1/ca.pod b/doc/man1/ca.pod
index 9c5af4a891..c09f98e96f 100644
--- a/doc/man1/ca.pod
+++ b/doc/man1/ca.pod
@@ -469,6 +469,10 @@ versions of OpenSSL. However, to make CA certificate roll-over easier,
it's recommended to use the value B<no>, especially if combined with
the B<-selfsign> command line option.
+Note that it is valid in some circumstances for certificates to be created
+without any subject. In the case where there are multiple certificates without
+subjects this does not count as a duplicate.
+
=item B<serial>
A text file containing the next serial number to use in hex. Mandatory.