diff --git a/scripts/check-manifests.sh b/scripts/check-manifests.sh
index 93a3252..d3a499b 100755
--- a/scripts/check-manifests.sh
+++ b/scripts/check-manifests.sh
@@ -46,7 +46,8 @@ if [[ ! -f "$MARKETPLACE" ]]; then
 fi
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-# shellcheck source=lib/marketplace-plugins.sh
+# Repo-root-relative, not script-dir-relative -- see tests/run-tests.sh for why.
+# shellcheck source=scripts/lib/marketplace-plugins.sh
 source "$SCRIPT_DIR/lib/marketplace-plugins.sh"
 
 # Every local plugin directory marketplace.json claimed, canonicalized, so the
diff --git a/tests/run-bats.sh b/tests/run-bats.sh
index 608273d..391fa24 100755
--- a/tests/run-bats.sh
+++ b/tests/run-bats.sh
@@ -51,7 +51,9 @@ fi
 # than a rolling `wait -n` pool.
 SCRATCH_ROOT="$(mktemp -d)"
 trap 'rm -rf "$SCRATCH_ROOT"' EXIT
-# shellcheck source=../scripts/lib/batch-run.sh
+# Repo-root-relative -- see tests/run-tests.sh for why `../scripts/...` does not
+# resolve here despite looking right.
+# shellcheck source=scripts/lib/batch-run.sh
 source "$REPO_ROOT/scripts/lib/batch-run.sh"
 
 declare -a batch_args=()
diff --git a/tests/run-tests.sh b/tests/run-tests.sh
index ba5b521..bf9569b 100755
--- a/tests/run-tests.sh
+++ b/tests/run-tests.sh
@@ -58,7 +58,19 @@ done < <(
 # rolling `wait -n` pool.
 SCRATCH_ROOT="$(mktemp -d)"
 trap 'rm -rf "$SCRATCH_ROOT"' EXIT
-# shellcheck source=lib/batch-run.sh
+# The source= path below is repo-root-relative, matching scripts/install.sh:5 --
+# NOT script-dir-relative. The source-path used to resolve it is the cwd
+# pre-commit invokes the linter from, which is the repo root, so `lib/...`
+# (resolving to a nonexistent tests/lib/) and `../scripts/...` (escaping the repo
+# entirely) both fail. Both spellings were live until issue #97, and neither was
+# visible: the resulting SC1091 is `info` while .pre-commit-config.yaml pins
+# `--severity=warning`. A directive that does not resolve also blinds
+# test-vale-wrap.sh's `sourced_files()` exemption, which reads these same
+# directives to find array seeding that lives in the sourced file.
+#
+# Do not start a comment line here with the linter's name -- it is parsed as a
+# directive and errors out (SC1073).
+# shellcheck source=scripts/lib/batch-run.sh
 source "$REPO_ROOT/scripts/lib/batch-run.sh"
 
 declare -a batch_args=()