Now that rust KUnit tests are protected with Kconfig, update the
documentation to mention it.

Signed-off-by: Yury Norov <[email protected]>
---
 Documentation/rust/testing.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/rust/testing.rst b/Documentation/rust/testing.rst
index f43cb77bcc69..24de173471b2 100644
--- a/Documentation/rust/testing.rst
+++ b/Documentation/rust/testing.rst
@@ -141,10 +141,13 @@ These tests are introduced by the ``kunit_tests`` 
procedural macro, which takes
 the name of the test suite as an argument.
 
 For instance, assume we want to test the function ``f`` from the documentation
-tests section. We could write, in the same file where we have our function:
+tests section. We could write, in the same file where we have our function.
+Each test is protected with the corresponding Kconfig option, see
+rust/kernel/Kconfig.test.
 
 .. code-block:: rust
 
+       #[cfg(CONFIG_RUST_MYMOD_KUNIT_TEST)]
        #[kunit_tests(rust_kernel_mymod)]
        mod tests {
            use super::*;
-- 
2.51.0


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