diff --git a/t5/data/preprocessors_test.py b/t5/data/preprocessors_test.py
index 983127e6..20cb79cf 100644
--- a/t5/data/preprocessors_test.py
+++ b/t5/data/preprocessors_test.py
@@ -1273,7 +1273,7 @@ def test_denoise(self):
           targets_fn=prep.nonnoise_span_to_unique_sentinel,
           input_feature_key='text_tokens')
 
-    # Two spans corrupted, [2] and [22, 3, 2, 7, 2], replaced by unique
+    # Two spans corrupted, [3] and [22, 3, 2, 7, 2], replaced by unique
     # sentinels 25 and 24 respectively.
     assert_dataset(denoised_dataset, [
         {