-top-level directory. Most tests are in the directory
-"test/". From the "test/" directory, run "make
-<filename>" to run the tests for <filename>.el(c). See
-"test/Makefile" for more information.
-
-Tests which are tagged ":expensive-test" are enabled additionally, if
-you run "make check-expensive" from the top-level directory. "make
-<filename>" as mentioned above incorporates expensive tests for
-<filename>.el(c). You can also define any ert selector on the command
-line. So "make check SELECTOR=nil" is equivalent to "make
-check-expensive".
-
-You could also use predefined selectors of the Makefile. "make
-<filename> SELECTOR='$(SELECTOR_DEFAULT)'" runs all tests for
-<filename>.el(c) except the tests tagged as expensive.
-
-Selectors can be defined with different methods, see (info "(ert)Test
-Selectors") or
-https://www.gnu.org/software/emacs/manual/html_node/ert/Test-Selectors.html
-If your test file contains the tests "test-foo", "test2-foo" and
-"test-foo-remote", and you want to run only the former two tests, you
-could use a regexp: "make <filename> SELECTOR='\"foo$$\"'" .
-
-** Understanding Emacs Internals.
-
-The best way to understand Emacs Internals is to read the code,
-but the nodes "Tips" and "GNU Emacs Internals" in the Appendix
-of the Emacs Lisp Reference Manual may also help. Some source files,
-such as xdisp.c, have large commentaries describing the design and
-implementation in more detail.
+top-level directory. Most tests are in the directory "test/". From
+the "test/" directory, run "make <filename>" to run the tests for
+<filename>.el(c). See "test/README" for more information.
+
+** Understanding Emacs internals
+
+The best way to understand Emacs internals is to read the code. Some
+source files, such as xdisp.c, have extensive comments describing the
+design and implementation. The following resources may also help:
+
+http://www.gnu.org/software/emacs/manual/html_node/elisp/Tips.html
+http://www.gnu.org/software/emacs/manual/html_node/elisp/GNU-Emacs-Internals.html
+
+or run 'info "(elisp)Tips"' or 'info "(elisp)GNU Emacs Internals"'.