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-rw-r--r--doc/manual/src/contributing/testing.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/src/contributing/testing.md b/doc/manual/src/contributing/testing.md
index c3c82e3c0..cd94d5cfb 100644
--- a/doc/manual/src/contributing/testing.md
+++ b/doc/manual/src/contributing/testing.md
@@ -7,7 +7,8 @@ under `src/{library_name}/tests` using the
[googletest](https://google.github.io/googletest/) and
[rapidcheck](https://github.com/emil-e/rapidcheck) frameworks.
-You can run the whole testsuite with `make check`, or the tests for a specific component with `make libfoo-tests_RUN`. Finer-grained filtering is also possible using the [--gtest_filter](https://google.github.io/googletest/advanced.html#running-a-subset-of-the-tests) command-line option.
+You can run the whole testsuite with `make check`, or the tests for a specific component with `make libfoo-tests_RUN`.
+Finer-grained filtering is also possible using the [--gtest_filter](https://google.github.io/googletest/advanced.html#running-a-subset-of-the-tests) command-line option, or the `GTEST_FILTER` environment variable.
## Functional tests