update MD by dispatch event pingcap/docs release-8.5

pingcap · Jan 24, 2025 · 3035869 · 3035869
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commit 3035869
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diff --git a/markdown-pages/en/tidb/release-8.5/tidb-limitations.md b/markdown-pages/en/tidb/release-8.5/tidb-limitations.md
@@ -66,6 +66,16 @@ You can adjust the size limit via the [`txn-entry-size-limit`](/tidb-configurati
 
 </CustomContent>
 
+## Limitations on indexes
+
+The maximum index length is 3072 bytes, equivalent to 768 characters using 4-byte UTF-8 encoding.
+
+<CustomContent platform="tidb">
+
+You can adjust this limit using the [`max-index-length`](/tidb-configuration-file.md#max-index-length) configuration item.
+
+</CustomContent>
+
 ## Limitations on data types
 
 | Type       | Upper limit   |