[TYPO3-english] question about php file size

[typo3 study]

Hi,

I download a php file: size 3.68 KB (3,777 bytes) from my typo3 site to my
local computer(win7) through ssh, then I removed one line code:
require('t3lib/class.t3lib_htmlmail.php');
But after I removed the code, the php file size changed to 3.74 KB (3,835
bytes), how could this be? Supposed the size should be smaller, right?

Tom