todo: Update

Signed-off-by: SeongJae Park <sj@kernel.org>
diff --git a/todo b/todo
index e7f270f..2b3f2e8 100644
--- a/todo
+++ b/todo
@@ -20,6 +20,7 @@
     https://lore.kernel.org/r/20240207203134.69976-1-sj@kernel.org
   - merged in mm tree
 - Self feedback based DAMOS tuning
+  - PSI metric implemented in damon/next
 
 Aiming next merge window
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