Add --error-file example

content/influxdb/v2.0/write-data/developer-tools/csv.md

@@ -227,6 +227,12 @@ Skipped rows are ignored and are not written to InfluxDB.
 {{% /warn %}}
 
 Use the `--error-file` flag to record errors to a file.
+The error file identifies all rows that cannot be imported and includes error messages for debugging.
+For example:
+
+```error : line 3: column 'a': '1.1' cannot fit into long data type
+cpu,1.1
+```
 
 ## Advanced examples