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-rw-r--r--doc/apps/ca.pod4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/apps/ca.pod b/doc/apps/ca.pod
index cc26bf48a3a7..8d94ecb4613e 100644
--- a/doc/apps/ca.pod
+++ b/doc/apps/ca.pod
@@ -424,6 +424,10 @@ 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.