diff --git a/man/authd.1 b/man/authd.1
index 159ee29..305e179 100644
--- a/man/authd.1
+++ b/man/authd.1
@@ -17,7 +17,9 @@ daemon is a micro-service providing authentication and authorization services.
 .Op Fl snREh
 .Op Fl k Ar key-file
 .Op Fl v Ar verbosity
+.Op Fl -configuration Ar file
 .Op Fl -project Ar project-name
+.
 .Op Fl -storage-directory Ar path
 .Op Fl -service-name Ar name
 .Op Fl -recreate-indexes
@@ -147,6 +149,9 @@ No configuration file should be read.
 .It Li -v No verbosity , Li --verbosity No level
 Verbosity level. From 0 to 4. Default: 4.
 .
+.It Li --configuration No file
+Alternative configuration file.
+.
 .It Li --project No project-name
 Project name, used for slotting to enable several instances of
 .Nm authd