diff --git a/docs/loading/Load_to_Primary_Key_tables.md b/docs/loading/Load_to_Primary_Key_tables.md
index 4502d87134386..aef84b1ce0272 100644
--- a/docs/loading/Load_to_Primary_Key_tables.md
+++ b/docs/loading/Load_to_Primary_Key_tables.md
@@ -459,6 +459,10 @@ As shown in the preceding query result, the record whose `id` is `101` in `examp
 
 Since v2.2, StarRocks supports updating only the specified columns of a table that uses the Primary Key table. This section uses CSV as an example to describe how to perform partial updates.
 
+> **NOTICE**
+>
+> When you perform a partial update, if the row to be updated does not exist, StarRocks inserts a new row, and fills default values in fields that are empty because no data updates are inserted into them.
+
 ### Data examples
 
 1. Prepare a data file.