diff --git a/testcases/t/198-urgency-timer.t b/testcases/t/200-urgency-timer.t
similarity index 86%
rename from testcases/t/198-urgency-timer.t
rename to testcases/t/200-urgency-timer.t
index d3cdb3d9..d6055114 100644
--- a/testcases/t/198-urgency-timer.t
+++ b/testcases/t/200-urgency-timer.t
@@ -1,6 +1,20 @@
 #!perl
 # vim:ts=4:sw=4:expandtab
 #
+# Please read the following documents before working on tests:
+# • http://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • http://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • http://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+#
 # Tests whether the urgency timer works as expected and does not break
 # urgency handling.
 #