Merge pull request denysdovhan#40 from MapleGu/patch-1

ECMAScript 5 specifies that 10 (decimal) is used

README.md

@@ -394,10 +394,12 @@ Don't forget about octals:
 
 ```js
 parseInt('06'); // 6
-parseInt('08'); // 0
+parseInt('08'); // 8 if support ECMAScript 5 
+parseInt('08'); // 0 if not support ECMAScript 5 
 ```
 
-**💡 Explanation:** This is because `parseInt` accepts a second argument for radix. If it is not supplied and the string starts with a `0` it will be parsed as an octal number.
+**💡 Explanation:** If the input string begins with "0", radix is eight (octal) or 10 (decimal). Exactly which radix is chosen is implementation-dependent. ECMAScript 5 specifies that 10 (decimal) is used, but not all browsers support this yet. For this reason always specify a radix when using `parseInt`.
+
 
 ## Math with `true` and `false`