diff --git a/doc/json_ui.asciidoc b/doc/json_ui.asciidoc
index c57deb0b..16f81468 100644
--- a/doc/json_ui.asciidoc
+++ b/doc/json_ui.asciidoc
@@ -3,9 +3,9 @@ Json-Rpc user interface
 
 Kakoune user interfaces can be implemented through the json-rpc 2.0 protocol.
 
-By launching kakoune in client mode with the `-j` option, the launched client
-will write json-rpc requests on stdout and read json-rpc requests on stdin.
-Errors will be reported on stderr (not in json format).
+By launching kakoune in client mode with the `-ui json` option, the launched
+client will write json-rpc requests on stdout and read json-rpc requests
+on stdin.  Errors will be reported on stderr (not in json format).
 
 Kakoune requests are always using positional parameters, never named, and
 Kakoune wont be able to parse named parameters in requests.