diff --git a/doc/manual/src/contributing/hacking.md b/doc/manual/src/contributing/hacking.md
index 9a03ac9b6..0fa59e891 100644
--- a/doc/manual/src/contributing/hacking.md
+++ b/doc/manual/src/contributing/hacking.md
@@ -51,11 +51,14 @@ To install it in `$(pwd)/outputs` and test it:
 
 ```console
 [nix-shell]$ make install
-[nix-shell]$ make installcheck -j $NIX_BUILD_CORES
+[nix-shell]$ make installcheck check -j $NIX_BUILD_CORES
 [nix-shell]$ nix --version
 nix (Nix) 2.12
 ```
 
+For more information on running and filtering tests, see
+[`testing.md`](./testing.md).
+
 To build a release version of Nix for the current operating system and CPU architecture:
 
 ```console
diff --git a/doc/manual/src/contributing/testing.md b/doc/manual/src/contributing/testing.md
index d8d162379..31c39c16c 100644
--- a/doc/manual/src/contributing/testing.md
+++ b/doc/manual/src/contributing/testing.md
@@ -77,7 +77,7 @@ there is no risk of any build-system wildcards for the library accidentally pick
 ### Running tests
 
 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.
+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, e.g. `GTEST_FILTER='ErrorTraceTest.*' make check`.
 
 ### Characterisation testing { #characaterisation-testing-unit }