Document -engine where missing.
PR: 424
diff --git a/doc/apps/genrsa.pod b/doc/apps/genrsa.pod
index cdcc03c..25af4d1 100644
--- a/doc/apps/genrsa.pod
+++ b/doc/apps/genrsa.pod
@@ -15,6 +15,7 @@
[B<-f4>]
[B<-3>]
[B<-rand file(s)>]
+[B<-engine id>]
[B<numbits>]
=head1 DESCRIPTION
@@ -54,6 +55,13 @@
The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
all others.
+=item B<-engine id>
+
+specifying an engine (by it's unique B<id> string) will cause B<req>
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed. The engine will then be set as the default
+for all available algorithms.
+
=item B<numbits>
the size of the private key to generate in bits. This must be the last option
