portion of a buffer. As you scroll through the buffer, each portion
that becomes visible is fontified as soon as it is displayed. The
parts of the buffer that are not displayed are fontified
-``stealthily'', in the background, i.e.@: when Emacs is idle. You can
+``stealthily,'' in the background, i.e.@: when Emacs is idle. You can
control this background fontification, also called @dfn{Just-In-Time}
(or @dfn{JIT}) Lock, by customizing variables in the customization
group @samp{jit-lock}. @xref{Specific Customization}.