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localization/v2.5.x/site/en/userGuide/search-query-get/use-partition-key.md

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 <h3 id="Create-Filtering-Condition​" class="common-anchor-header">Create Filtering Condition​</h3><p>When conducting ANN searches in a collection with the Partition Key feature enabled, you need to include a filtering expression involving the Partition Key in the search request. In the filtering expression, you can restrict the Partition Key value within a specific range so that Milvus restricts the search scope within the corresponding partitions.​</p>
+<p>When dealing with delete operations, It is advisable to include a filter expression that specifies a single partition key to achieve more efficient deletion. This approach limits the delete operation to a particular partition, reducing write amplification during compaction and conserving resources for compaction and indexing.</p>
 <p>The following examples demonstrate Partition-Key-based filtering based on a specific Partition Key value and a set of Partition Key values.​</p>
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