diff --git a/core/types.rs b/core/types.rs
index 606305e30..29bfc740e 100644
--- a/core/types.rs
+++ b/core/types.rs
@@ -1101,9 +1101,17 @@ impl Default for IndexKeySortOrder {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+/// Metadata about an index, used for handling and comparing index keys.
+///
+/// This struct provides information about the sorting order of columns,
+/// whether the index includes a row ID, and the total number of columns
+/// in the index.
 pub struct IndexKeyInfo {
+    /// Specifies the sorting order (ascending or descending) for each column in the index.
     pub sort_order: IndexKeySortOrder,
+    /// Indicates whether the index includes a row ID column.
     pub has_rowid: bool,
+    /// The total number of columns in the index, including the row ID column if present.
     pub num_cols: usize,
 }