1 files changed, 1 insertions, 0 deletions
diff --git a/README.md b/README.md
index a16d5fb..18d5b26 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,7 @@ optional arguments:
                         path to your account public key
   -e EMAIL, --email EMAIL
                         contact email, default is webmaster@<shortest_domain>
+  -f, --file-based      if set, a file-based response is used
 user@hostname:~$
 ```