 Many people are opposed to single sentence spacing for various reasons . Some state that the habit of double spacing is too deeply <unk> to change . Others claim that additional space between sentences improves the aesthetics or readability of text . Proponents of double sentence spacing also state that some publishers may still require double @-@ spaced manuscript submissions from authors . A key example noted is the screenwriting industry 's monospaced standard for screenplay manuscripts , Courier , 12 @-@ point font , although some works on screenwriting indicate that Courier is merely preferred – proportional fonts may be used . Some reliable sources state simply that writers should follow their particular style guide , but proponents of double spacing caution that publishers ' guidance takes precedence , including those that ask for double sentence spaced manuscripts . 
