diff --git a/README.md b/README.md
index b8c91bc..924785d 100644
--- a/README.md
+++ b/README.md
@@ -102,10 +102,14 @@ options:
 ```
 ### UPDATE
 ```
-usage: knotctl update [-h] -d DATA -n NAME -r RTYPE -t TTL -z ZONE
+usage: knotctl update [-h] -a [ARGUMENT ...] -d DATA -n NAME -r RTYPE [-t TTL]
+                      -z ZONE
 
 options:
   -h, --help            show this help message and exit
+  -a [ARGUMENT ...], --argument [ARGUMENT ...]
+                        Specify key - value pairs to be updated:
+                        name=dns1.example.com.
   -d DATA, --data DATA
   -n NAME, --name NAME
   -r RTYPE, --rtype RTYPE