diff --git a/web/src/components/SftCorrectionArea.test.ts b/web/src/components/SftCorrectionArea.test.ts
index 5c72d6a..8ecc409 100644
--- a/web/src/components/SftCorrectionArea.test.ts
+++ b/web/src/components/SftCorrectionArea.test.ts
@@ -59,4 +59,10 @@ describe('SftCorrectionArea', () => {
     await w.find('textarea').trigger('keydown', { key: 'Enter', ctrlKey: true })
     expect(w.emitted('submit')).toBeFalsy()
   })
+
+  it('omits aria-describedby when describedBy prop is not provided', () => {
+    const w = mount(SftCorrectionArea)
+    const textarea = w.find('textarea')
+    expect(textarea.attributes('aria-describedby')).toBeUndefined()
+  })
 })
diff --git a/web/src/components/SftCorrectionArea.vue b/web/src/components/SftCorrectionArea.vue
index b9279f5..44dfd2e 100644
--- a/web/src/components/SftCorrectionArea.vue
+++ b/web/src/components/SftCorrectionArea.vue
@@ -10,7 +10,7 @@
       class="correction-textarea"
       aria-label="Write corrected response"
       aria-required="true"
-      :aria-describedby="describedBy"
+      :aria-describedby="describedBy || undefined"
       placeholder="Write the response this model should have given..."
       rows="4"
       @keydown.escape="$emit('cancel')"