diff --git a/4 Qualifying Exam/1 Managing Stuff/0. QE To Do List.md b/4 Qualifying Exam/1 Managing Stuff/0. QE To Do List.md
index f2683bdc..2ea669e6 100644
--- a/4 Qualifying Exam/1 Managing Stuff/0. QE To Do List.md	
+++ b/4 Qualifying Exam/1 Managing Stuff/0. QE To Do List.md	
@@ -52,7 +52,7 @@
 - [/] Diffusion models in eng.
 - [-] Research Motivation (RA) ❌ 2024-12-03
 - [ ] Diffusion Model basics
-- [ ] diffusion model eq
+- [x] diffusion model eq ✅ 2024-12-05
 - [ ] diff model features
 - [ ] freq features
 - [ ] training