diff --git a/docs/cmdline-opts/json.md b/docs/cmdline-opts/json.md
index 8056e62e7c..7763d81ee0 100644
--- a/docs/cmdline-opts/json.md
+++ b/docs/cmdline-opts/json.md
@@ -24,7 +24,7 @@ Example:
 Sends the specified JSON data in a POST request to the HTTP server. --json
 works as a shortcut for passing on these three options:
 
-    --data [arg]
+    --data-binary [arg]
     --header "Content-Type: application/json"
     --header "Accept: application/json"