diff --git a/datafusion/core/src/physical_plan/file_format/csv.rs b/datafusion/core/src/physical_plan/file_format/csv.rs
index 09d7bf82faeb..3723df9c49c4 100644
--- a/datafusion/core/src/physical_plan/file_format/csv.rs
+++ b/datafusion/core/src/physical_plan/file_format/csv.rs
@@ -443,6 +443,7 @@ mod tests {
         assert_eq!(14, csv.projected_schema.fields().len());
         assert_eq!(14, csv.schema().fields().len());
 
+        // errors due to https://github.com/apache/arrow-datafusion/issues/4918
         let mut it = csv.execute(0, task_ctx)?;
         let err = it.next().await.unwrap().unwrap_err().to_string();
         assert_eq!(