Update dashboard/dashboard-faq.md

pingcap · Jul 29, 2021 · 5cca31f · 5cca31f
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diff --git a/dashboard/dashboard-faq.md b/dashboard/dashboard-faq.md
@@ -60,7 +60,7 @@ The possible reason is that you have enabled the `prepared-plan-cache` feature o
 
 ### An `unknown field` error is shown in **Slow Queries** page
 
-If the `unknown field` error appears on the **Slow Queries** page after the cluster upgrade, the error is related to a compatibility issue caused by the difference between TiDB Dashboard server fields (which might be updated) and user preferences fields (which are in the browser cache). This issue has been fixed.
+If the `unknown field` error appears on the **Slow Queries** page after the cluster upgrade, the error is related to a compatibility issue caused by the difference between TiDB Dashboard server fields (which might be updated) and user preferences fields (which are in the browser cache). This issue has been fixed. If your cluster is earlier than v5.0.3 or v4.0.14, perform the following steps to resolve the issue:
 
 To clear your browser cache, take the following steps: