Update README text on command options

README.md

@@ -70,7 +70,9 @@ Or, alternatively, you load the plugin at runtime with the `plugin` command:
 
     plugin -i slang
 
-After the plugin has been loaded, the frontend is invoked with the `read_slang` command. The command accepts standard slang options, see `help read_slang` and [slang documentation](https://www.sv-lang.com/command-line-ref.html).
+After the plugin has been loaded, the frontend is invoked with the `read_slang` command.
+
+For a full documentation of the command options, see `help read_slang`. The command understands standard [slang options](https://www.sv-lang.com/command-line-ref.html) in addition to other options.
 
 Sample usage: