diff --git a/Changelog.md b/Changelog.md
index ba7bbbc..8011bcb 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -3,6 +3,12 @@ All updates to the Ryujinx official master build will be documented in this file
 
 For 1.0.x releases, see [here](https://github.com/Ryujinx/Ryujinx/wiki/Older-Changelog).
 
+## 1.1.991 - 2023-08-16
+### Fixed:
+- GPU: Add Z16RUnormGUintBUintAUint format.
+  - Fixes graphical issues in Asterix & Obelix XXL: Romastered, Go Rally, Monster Blast, Pyramid Ques and Spencer.
+  - May fix similar issues in games using OpenGL on the Switch.
+
 ## 1.1.990 - 2023-08-16
 ### Fixed:
 - UI: New Crowdin updates.