diff -r 0fb5cc208e71 -r b95ebdbf68ca doc/testing.md
--- a/doc/testing.md	Thu Jul 18 09:15:26 2019 -0700
+++ b/doc/testing.md	Thu Jul 18 11:47:52 2019 -0700
@@ -306,6 +306,14 @@
 The file names should be either absolute, or relative to the JTReg test root of
 the tests to be run.
 
+#### RUN_PROBLEM_LISTS
+
+Use the problem lists to select tests instead of excluding them.
+
+Set to `true` or `false`.
+If `true`, JTReg will use `-match:` option, otherwise `-exclude:` will be used.
+Default is `false`.
+
 
 #### OPTIONS
 Additional options to the JTReg test framework.