diff --git a/internal/core/notebook_test.go b/internal/core/notebook_test.go
new file mode 100644
index 00000000..f353cd83
--- /dev/null
+++ b/internal/core/notebook_test.go
@@ -0,0 +1,47 @@
+package core
+
+import (
+	"testing"
+
+	"github.com/zk-org/zk/internal/util"
+	"github.com/zk-org/zk/internal/util/test/assert"
+)
+
+// TestRelPathResolvesInsideNotebook tests that Notebook.RelPath() resolves
+// relative paths relative to the notebook directory.
+func TestRelPathResolvesInsideNotebook(t *testing.T) {
+	notebookPath := "/notebook"
+	workingDir := "/notebook"
+
+	fs := newFileStorageMock(workingDir, []string{notebookPath})
+
+	notebook := NewNotebook(notebookPath, NewDefaultConfig(), NotebookPorts{
+		FS:     fs,
+		Logger: &util.NullLogger,
+	})
+
+	relPath, err := notebook.RelPath("inbox/note.md")
+
+	assert.Nil(t, err)
+	assert.Equal(t, relPath, "inbox/note.md")
+}
+
+// TestRelPathResolvesOutsideNotebook tests that Notebook.RelPath() resolves
+// relative paths relative to the notebook directory, not the current working
+// directory.
+func TestRelPathResolvesOutsideNotebook(t *testing.T) {
+	notebookPath := "/notebook"
+	workingDir := "/other/dir"
+
+	fs := newFileStorageMock(workingDir, []string{notebookPath})
+
+	notebook := NewNotebook(notebookPath, NewDefaultConfig(), NotebookPorts{
+		FS:     fs,
+		Logger: &util.NullLogger,
+	})
+
+	relPath, err := notebook.RelPath("inbox/note.md")
+
+	assert.Nil(t, err)
+	assert.Equal(t, relPath, "inbox/note.md")
+}
diff --git a/tests/linked-by-hierarchical-path.tesh b/tests/linked-by-hierarchical-path.tesh
new file mode 100644
index 00000000..b65f8c07
--- /dev/null
+++ b/tests/linked-by-hierarchical-path.tesh
@@ -0,0 +1,13 @@
+# XXX: untested, can't get tesh to work
+
+# Running from notebook directory.
+$ cd full-sample
+$ zk list -qf\{{title}} --linked-by inbox/er4k.md
+>Channel
+>Ownership in Rust
+
+# Running from outside notebook with --notebook-dir.
+$ cd ..
+$ zk list --notebook-dir=full-sample -qf\{{title}} --linked-by inbox/er4k.md
+>Channel
+>Ownership in Rust