diff --git a/doc/apps/x509.pod b/doc/apps/x509.pod
index b7fc422a309d4c60fa4bb422d5295e183ed68936..c0c39770cec84683a5bfff419adf4d61b2c9cf40 100644
--- a/doc/apps/x509.pod
+++ b/doc/apps/x509.pod
@@ -155,7 +155,7 @@ outputs the "hash" of the certificate issuer name.
 
 =item B<-hash>
 
-synonym for "-hash" for backward compatibility reasons.
+synonym for "-subject_hash" for backward compatibility reasons.
 
 =item B<-subject>