(@code{f90-mode}). Emacs normally uses Fortran mode for files with
extension @samp{.f}, @samp{.F} or @samp{.for}, and F90 mode for the
extensions @samp{.f90}, @samp{.f95}, @samp{.f03} and @samp{.f08}.
Customize @code{auto-mode-alist} to add more extensions. GNU Fortran
supports both free and fixed form. This manual mainly documents Fortran
mode, but the corresponding F90 mode features are mentioned when
(@code{f90-mode}). Emacs normally uses Fortran mode for files with
extension @samp{.f}, @samp{.F} or @samp{.for}, and F90 mode for the
extensions @samp{.f90}, @samp{.f95}, @samp{.f03} and @samp{.f08}.
Customize @code{auto-mode-alist} to add more extensions. GNU Fortran
supports both free and fixed form. This manual mainly documents Fortran
mode, but the corresponding F90 mode features are mentioned when