+@defvar multi-query-replace-map
+This variable holds a keymap that extends @code{query-replace-map} by
+providing additional keybindings that are useful in multi-buffer
+replacements.
+@end defvar
+
+@defvar replace-search-function
+This variable specifies a function that @code{perform-replace} calls
+to search for the next string to replace. Its default value is
+@code{search-forward}. Any other value should name a function of 3
+arguments: the first 3 arguments of @code{search-forward}
+(@pxref{String Search}).
+@end defvar
+
+@defvar replace-re-search-function
+This variable specifies a function that @code{perform-replace} calls
+to search for the next regexp to replace. Its default value is
+@code{re-search-forward}. Any other value should name a function of 3
+arguments: the first 3 arguments of @code{re-search-forward}
+(@pxref{Regexp Search}).
+@end defvar
+