commands are unusual: they use the minibuffer to read the regular
expression even though they are invoked from the minibuffer. As with
incremental searching, an upper-case letter in the regular expression
-makes the search case-sensitive (@pxref{Search Case}).
+makes the search case-sensitive (@pxref{Search Case}). You can also
+search through the history using an incremental search (@pxref{Isearch
+Minibuffer}).
All uses of the minibuffer record your input on a history list, but
there are separate history lists for different kinds of arguments.