diff --git a/docs/en/sql-reference/window-functions/first_value.md b/docs/en/sql-reference/window-functions/first_value.md
index 575a6fc3f48..17ca1cacda8 100644
--- a/docs/en/sql-reference/window-functions/first_value.md
+++ b/docs/en/sql-reference/window-functions/first_value.md
@@ -6,18 +6,25 @@ sidebar_position: 3
 
 # first_value
 
-Returns the first non-NULL value evaluated within its ordered frame.
+Returns the first value evaluated within its ordered frame. By default, NULL arguments are skipped, however the `RESPECT NULLS` modifier can be used to override this behaviour.
 
 **Syntax**
 
 ```sql
-first_value (column_name)
+first_value (column_name) [RESPECT NULLS]
   OVER ([[PARTITION BY grouping_column] [ORDER BY sorting_column] 
         [ROWS or RANGE expression_to_bound_rows_withing_the_group]] | [window_name])
 FROM table_name
 WINDOW window_name as ([[PARTITION BY grouping_column] [ORDER BY sorting_column])
 ```
 
+Alias: `any`.
+
+:::note
+Using the optional modifier `RESPECT NULLS` after `first_value(column_name)` will ensure that `NULL` arguments are not skipped.
+See [NULL processing](../aggregate-functions/index.md/#null-processing) for more information.
+:::
+
 For more detail on window function syntax see: [Window Functions - Syntax](./index.md/#syntax).
 
 **Returned value**
diff --git a/docs/en/sql-reference/window-functions/index.md b/docs/en/sql-reference/window-functions/index.md
index 712b99992ea..0c3e2ea1cb6 100644
--- a/docs/en/sql-reference/window-functions/index.md
+++ b/docs/en/sql-reference/window-functions/index.md
@@ -77,8 +77,8 @@ WINDOW window_name as ([[PARTITION BY grouping_column] [ORDER BY sorting_column]
 These functions can be used only as a window function.
 
 - [`row_number()`](./row_number.md) - Number the current row within its partition starting from 1.
-- [`first_value(x)`](./first_value.md) - Return the first non-NULL value evaluated within its ordered frame.
-- [`last_value(x)`](./last_value.md) -	Return the last non-NULL value evaluated within its ordered frame.
+- [`first_value(x)`](./first_value.md) - Return the first value evaluated within its ordered frame.
+- [`last_value(x)`](./last_value.md) -	Return the last value evaluated within its ordered frame.
 - [`nth_value(x, offset)`](./nth_value.md) - Return the first non-NULL value evaluated against the nth row (offset) in its ordered frame.
 - [`rank()`](./rank.md) - Rank the current row within its partition with gaps.
 - [`dense_rank()`](./dense_rank.md) - Rank the current row within its partition without gaps.
diff --git a/docs/en/sql-reference/window-functions/last_value.md b/docs/en/sql-reference/window-functions/last_value.md
index 99b7ca4f75a..9d1ce81cc57 100644
--- a/docs/en/sql-reference/window-functions/last_value.md
+++ b/docs/en/sql-reference/window-functions/last_value.md
@@ -6,18 +6,25 @@ sidebar_position: 4
 
 # last_value
 
-Returns the last non-NULL value evaluated within its ordered frame.
+Returns the last value evaluated within its ordered frame. By default, NULL arguments are skipped, however the `RESPECT NULLS` modifier can be used to override this behaviour.
 
 **Syntax**
 
 ```sql
-last_value (column_name)
+last_value (column_name) [RESPECT NULLS]
   OVER ([[PARTITION BY grouping_column] [ORDER BY sorting_column] 
         [ROWS or RANGE expression_to_bound_rows_withing_the_group]] | [window_name])
 FROM table_name
 WINDOW window_name as ([[PARTITION BY grouping_column] [ORDER BY sorting_column])
 ```
 
+Alias: `anyLast`.
+
+:::note
+Using the optional modifier `RESPECT NULLS` after `first_value(column_name)` will ensure that `NULL` arguments are not skipped.
+See [NULL processing](../aggregate-functions/index.md/#null-processing) for more information.
+:::
+
 For more detail on window function syntax see: [Window Functions - Syntax](./index.md/#syntax).
 
 **Returned value**