diff --git a/Help/variable/CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.rst b/Help/variable/CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.rst
index 5aeae88..9f145c1 100644
--- a/Help/variable/CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.rst
+++ b/Help/variable/CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.rst
@@ -5,4 +5,7 @@
 will be collected by the :command:`ctest_test` command. Defaults to 307200
 (300 KiB).
 
+If a test's output contains the literal string "CTEST_FULL_OUTPUT",
+the output will not be truncated and may exceed the maximum size.
+
 .. include:: CTEST_CUSTOM_XXX.txt
diff --git a/Help/variable/CTEST_CUSTOM_MAXIMUM_PASSED_TEST_OUTPUT_SIZE.rst b/Help/variable/CTEST_CUSTOM_MAXIMUM_PASSED_TEST_OUTPUT_SIZE.rst
index 1fbb8c5..71ecf52 100644
--- a/Help/variable/CTEST_CUSTOM_MAXIMUM_PASSED_TEST_OUTPUT_SIZE.rst
+++ b/Help/variable/CTEST_CUSTOM_MAXIMUM_PASSED_TEST_OUTPUT_SIZE.rst
@@ -5,4 +5,7 @@
 will be collected by the :command:`ctest_test` command. Defaults to 1024
 (1 KiB).
 
+If a test's output contains the literal string "CTEST_FULL_OUTPUT",
+the output will not be truncated and may exceed the maximum size.
+
 .. include:: CTEST_CUSTOM_XXX.txt