@cindex M-
Emacs also recognizes control characters that are entered using
@dfn{modifier keys}. Two commonly-used modifier keys are
-@key{Control} (usually labelled @key{Ctrl}), and @key{Meta} (usually
+@key{Control} (usually labeled @key{Ctrl}), and @key{Meta} (usually
labeled @key{Alt})@footnote{We refer to @key{Alt} as @key{Meta} for
historical reasons.}. For example, @kbd{Control-a} is entered by
holding down the @key{Ctrl} key while pressing @kbd{a}; we will refer