update doc/README.md

doc/README.md

@@ -8,23 +8,35 @@ scritcher scripts are shell-like commands separated by a semicolon.
 some commands allow a `:N` syntax where N is an integer to use a given
 argument when `scritcher` is called. so, for example, calling a script:
 ```
-load :1;
+load :0;
 showpath;
 ```
 
 and then doing `scritcher path/to/script.scri arg` will print `arg` on the
 screen and then exit.
 
+## split and index arguments
+
+plugin commands have a split and an index argument so that you can select
+where in the file you want the plugin to be ran.
+
+so, if you did `plugin 3 1...`, it would split the file in 3, then get the
+part that is of index 1 (starting at 0).
 
 ## `load path_or_arg`
 
-Load a file into memory. The file will be converted to BMP.
+Load a file into memory. The file MUST end with the bmp extension (and so MUST
+be a bmp. feel free to put other files, no warranties are given.)
 
-## `echo split index delay`
+## `amp split index gain`
+
+Run the eg-amp plugin over the given slice of the file.
+
+## TODO `echo split index delay`
 
 Run an echo filter on the given loaded file.
 
-## `quicksave`
+## TODO `quicksave`
 
 Save the file on the same directory of the file specified by `load`, but
 with a suffix on the filename (before extension).
@@ -32,6 +44,6 @@ with a suffix on the filename (before extension).
 Doing consecutive `quicksave`s will not overwrite any files, the suffixes will
 just be different.
 
-## `showpath`
+## TODO `showpath`
 
 Print the current loaded path on the screen.