diff --git a/README.md b/README.md
index f42ebb9..ae7a2f9 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,6 @@ import Mass from 'mass.js';
 let value = Mass.parse('5 lbs 8 oz');  // Parse string for mass
 value += 5.5;                          // Add 5.5 pounds
 Mass.format(value);                    // Format total: "11 lb"
-Mass.format(value, { written: true }); // Written format: "eleven pounds"
 ```
 
 ## Units
@@ -55,19 +54,12 @@ Format number as string.
 
 - **unit:** `(number|string)` Base unit value or string for lookup (default: 1).
 
-- **written:** `(Object|string|boolean)` [n2words](https://github.com/forzagreen/n2words) options or language identifier (as string), otherwise boolean (default: false).
-
 Returns `value` formatted as `string`, or if unit lookup fails, `undefined`.
 
 **Examples:**
 
 ```javascript
 Mass.format(11);
-
-Mass.format(176, {
-    unit: 'oz',
-    written: true
-});
 ```
 
 ------------