diff --git a/test/cases/CMakeLists.txt b/test/cases/CMakeLists.txt
index 3c776dd5..f8f18380 100644
--- a/test/cases/CMakeLists.txt
+++ b/test/cases/CMakeLists.txt
@@ -1 +1,5 @@
+# Tests can be grouped into subdirectories for better organization.
+# Each subdirectory must contain a CMakeLists.txt file
+# that lists the test executables *and* the tests themselves.
+
 add_subdirectory(basic)
\ No newline at end of file