How to only hook on Single.php after content?

This will handle appending the content to single posts:

function yourprefix_add_to_content( $content ) {    
    if( is_single() ) {
        $content .= 'Your new content here';
    }
    return $content;
}
add_filter( 'the_content', 'yourprefix_add_to_content' );

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