be a regular expression (@pxref{Regexps}). Browse the buffer popped
up by Emacs, to find what you are looking for. @xref{Apropos}.
-@item M-x apropos @var{topic} @key{RET}
+@item M-x apropos @key{RET} @var{topic} @key{RET}
This works like @kbd{C-h a}, but it also searches for user options and
other variables, in case the feature you are looking for is controlled
by an option, not a command. @xref{Apropos}.
-@item M-x apropos-documentation @var{topic} @key{RET}
+@item M-x apropos-documentation @key{RET} @var{topic} @key{RET}
This searches the @emph{documentation strings} (the built-in short
descriptions) of all variables and functions (not their names) for a
match for @var{topic}, a regular expression. @xref{Apropos}.
@item @key{SPC}
Scroll forward.
@item @key{DEL}
-Scroll backward.
+@itemx @key{BS}
+Scroll backward. On some keyboards, this key is known as @key{BS} or
+@key{backspace}.
@item @key{RET}
Follow a cross reference at point.
@item @key{TAB}