diff --git a/README.md b/README.md
index 1db6e8923e..4aad8fe82a 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ This is the Svelte compiler, which is primarily intended for authors of tooling
 import * as svelte from 'svelte/compiler';
 
 const { js, css } = svelte.compile(source, {
-	// the target module format – defaults to 'esm' (ES2015 modules), can also be 'cjs'
+	// the target module format – defaults to 'esm' (ES2015 module), can also be 'cjs' (CommonJS module)
 	format: 'cjs',
 
 	// the filename of the source file, used in e.g. generating sourcemaps
@@ -91,14 +91,14 @@ The Svelte compiler optionally takes a second argument, an object of configurati
 | `immutable` | `boolean` | Whether to use object comparisons that assume immutability. This only affects components without `<svelte:options immutable={...}/>`, which has higher precedence than this option. | `false` |
 | `legacy` | `boolean` | Ensures compatibility with very old browsers, at the cost of some extra code. | `false` |
 | | | |
-| `preserveWhitespace` | `boolean` | TODO | `false` |
+| `preserveWhitespace` | `boolean` | Whether to preserve multiple whitespace characters outside of a `<pre>`. | `false` |
 | `preserveComments` | `boolean` | Include comments in rendering. Currently, only applies to SSR rendering. | `false` |
 | | | |
 | `format` | `'esm'`, `'cjs'` | The format to output in the compiled component.<br>`'esm'` - ES6/ES2015 module, suitable for consumption by a bundler<br>`'cjs'` - CommonJS module | `'esm'` |
 | `name` | `string` | The name of the constructor in the compiled component. | `'SvelteComponent'` |
 | `filename` | `string` | The filename to use in sourcemaps and compiler error and warning messages. | `'SvelteComponent.html'` |
-| `outputFilename` | `string` | TODO | TODO |
-| `cssOutputFilename` | `string` | TODO | TODO |
+| `outputFilename` | `string` | The filename to use in the generated sourcemap. | `null` |
+| `cssOutputFilename` | `string` | The filename to use in the generated CSS sourcemap. | `null` |
 | `sveltePath` | `string` | The path to the root of the package used in `import`s generated by the compiler. | `'svelte'` |
 
 ### Preprocessor options