diff --git a/COMPAT.md b/COMPAT.md
index d668c6f20..e14c04005 100644
--- a/COMPAT.md
+++ b/COMPAT.md
@@ -95,6 +95,7 @@ Turso aims to be fully compatible with SQLite, with opt-in features not supporte
 | UPDATE                    | Yes     |                                                                                   |
 | VACUUM                    | No      |                                                                                   |
 | WITH clause               | Partial | No RECURSIVE, no MATERIALIZED, only SELECT supported in CTEs                      |
+| WINDOW functions             | Partial | only default frame definition, no window-specific functions (rank() etc)         |
 
 #### [PRAGMA](https://www.sqlite.org/pragma.html)