Update test comment.

Test: pass
Change-Id: Icd0e91f2ec441e11daf609d5d1439c61c9771c69
diff --git a/payload_consumer/delta_performer_integration_test.cc b/payload_consumer/delta_performer_integration_test.cc
index d2e0f6c..f2aeb03 100644
--- a/payload_consumer/delta_performer_integration_test.cc
+++ b/payload_consumer/delta_performer_integration_test.cc
@@ -1261,7 +1261,7 @@
   manifest.set_partial_update(true);
   {
     auto& partition = *manifest.add_partitions();
-    // For partial updates, missing timestamp should trigger an error
+    // For partial updates, invalid timestamp should trigger an error
     partition.set_partition_name("product");
     partition.set_version("something");
   }