Resolves #16

snippets/capitalize-first-letter.md

@@ -1,7 +1,9 @@
 ### Capitalize first letter
 
 Use `slice(0,1)` and `toUpperCase()` to capitalize first letter, `slice(1)` to get the rest of the string.
+Omit the `lowerRest` parameter to keep the rest of the string intact, or set it to `true` to convert to lower case.
 
 ```js
-const capitalize = str => str.slice(0, 1).toUpperCase() + str.slice(1);
+const capitalize = (str, lowerRest = false) =>
+  str.slice(0, 1).toUpperCase() + (lowerRest? str.slice(1).toLowerCase() : str.slice(1));
 ```