diff --git a/.github/workflows/GnuTests.yml b/.github/workflows/GnuTests.yml
index fbd6f4c0f..6b9cdefc6 100644
--- a/.github/workflows/GnuTests.yml
+++ b/.github/workflows/GnuTests.yml
@@ -1,6 +1,8 @@
 name: GnuTests
 
-# spell-checker:ignore (names) gnulib ; (jargon) submodules ; (people) Dawid Dziurla * dawidd ; (utils) autopoint chksum gperf pyinotify shopt texinfo ; (vars) FILESET XPASS
+# spell-checker:ignore (names) gnulib ; (jargon) submodules ; (people) Dawid Dziurla * dawidd ; (utils) autopoint chksum gperf pyinotify shopt texinfo ; (vars) FILESET SUBDIRS XPASS
+
+# * note: to run a single test => `REPO/util/run-gnu-test.sh PATH/TO/TEST/SCRIPT`
 
 on: [push, pull_request]
 
diff --git a/util/run-gnu-test.sh b/util/run-gnu-test.sh
index f478e4058..9b784699c 100755
--- a/util/run-gnu-test.sh
+++ b/util/run-gnu-test.sh
@@ -6,6 +6,9 @@
 
 # spell-checker:ignore (env/vars) GNULIB SRCDIR SUBDIRS ; (utils) shellcheck
 
+# ref: [How the GNU coreutils are tested](https://www.pixelbeat.org/docs/coreutils-testing.html) @@ <https://archive.is/p2ITW>
+# * note: to run a single test => `make check TESTS=PATH/TO/TEST/SCRIPT SUBDIRS=. VERBOSE=yes`
+
 ME_dir="$(dirname -- "$(readlink -fm -- "$0")")"
 REPO_main_dir="$(dirname -- "${ME_dir}")"