Update README

Author: danielbachhuber

README.md

@@ -134,7 +134,7 @@ change primary key values.
     $ wp search-replace '\[foo id="([0-9]+)"' '[bar id="\1"' --regex --regex-flags='i'
 
     # Turn your production multisite database into a local dev database
-    $ wp search-replace --url=example.com example.com example.test 'wp_*options' wp_blogs
+    $ wp search-replace --url=example.com example.com example.test 'wp_*options' wp_blogs wp_site --network
 
     # Search/replace to a SQL file without transforming the database
     $ wp search-replace foo bar --export=database.sql