diff --git a/sql/data-types/array-type.mdx b/sql/data-types/array-type.mdx
index 479b1811..531baf8a 100644
--- a/sql/data-types/array-type.mdx
+++ b/sql/data-types/array-type.mdx
@@ -1,6 +1,6 @@
 ---
 title: "ARRAY type"
-description: "An array `T[]` is an ordered list of zero or more elements that share the same data type. RisingWave uses one-based indexing for arrays, meaning an array with n elements starts at `array[1]` and ends at `array[n]`."
+description: "An array `T[]` is an ordered list of zero or more elements that share the same data type. PostgreSQL uses one-based indexing for arrays, meaning an array with n elements starts at `array[1]` and ends at `array[n]`. RisingWave also applies one-based indexing to align with PostgreSQL."
 ---
 
 ## Define an array