I have this line added to my .htaccess which is suppose to make all .png files cacheable until end of the month.
<FilesMatch "\.(ico|flv|jpe?g|png|gif|js|css|swf)$">
ExpiresActive On
ExpiresDefault "access plus 1 month"
</FilesMatch>
But when I run Google PageSpeed it still says that those images are not cacheable. What am I doing wrong here?